At 1:17 how would the 25th and 26th be the two data points if the number of consecutive days is 50?

since 50 is an even number, the median (or the middle number of days) is going to be the two middle values. Consider writing out all the number of days from 1-50, and try to find the median values.

Where and how did he get the 23 lowest? I was really thrown off. I've tried re-watching it multiple times but I still cant seem to figure it out.

The histogram tells us that out of the 50 days, there were... ...2 days when Miguel slept between 6 and 6.5 hours. ...9 days when he slept between 6.5 and 7 hours. ...12 days when he slept between 7 and 7.5 hours. ...12 days when he slept between 7.5 and 8 hours. ...11 days when he slept between 8 and 8.5 hours. ...2 days when he slept between 8.5 and 9 hours. ...2 days when he slept between 9 and 9.5 hours. This means that there were 2 + 9 + 12 = 23 days when Miguel got less than 7.5 hours of sleep, which are also the 23 days when he got the least amount of sleep because all the other days he got 7.5 hours of sleep or more.

hey how does this help in life

@robitaille.alexandre it helps in life because when you are trying to find the average of say, how much you spend in a month, it is easy to calculate.

i have confusion in finding median

The mean is all the numbers added up together, then divided by the number of numbers you added up

Main content

AP®︎/College Statistics

Course: AP®︎/College Statistics > Unit 3

Lesson 1: Measuring center in quantitative data

Median in a histogram

Name: Median in a histogram
Uploaded: 2018-08-13T17:33:52Z
Description: Worked example from Khan Academy finding the interval in a histogram containing the media of a data set.

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Worked example from Khan Academy finding the interval in a histogram containing the media of a data set.

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ingaldsl
Posted 5 years ago. Direct link to ingaldsl's post “I am frustrated with the ...”
I am frustrated with the measuring center quantitative data scoring for completion of calculating the median. My answers are correct, but the dialog box shows I need to "try again" or more to the answer is requested. I had no problems with practice calculating the mean. What am I doing wrong? I sent my feedback on the issue, but seem to be getting nowhere.
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(17 votes)
Answer
bb22396
Posted 5 years ago. Direct link to bb22396's post “At 1:17 how would the 25t...”
At
1:17
how would the 25th and 26th be the two data points if the number of consecutive days is 50?
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(7 votes)
Answer
- Maaneha Faisal
  Posted 5 years ago. Direct link to Maaneha Faisal's post “since 50 is an even numbe...”
  since 50 is an even number, the median (or the middle number of days) is going to be the two middle values.
  Consider writing out all the number of days from 1-50, and try to find the median values.
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  (7 votes)
Princesslealea
Posted 4 years ago. Direct link to Princesslealea's post “Where and how did he get ...”
Where and how did he get the 23 lowest? I was really thrown off. I've tried re-watching it multiple times but I still cant seem to figure it out.
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(4 votes)
Answer
- Jerry Nilsson
  Posted 4 years ago. Direct link to Jerry Nilsson's post “The histogram tells us th...”
  The histogram tells us that out of the 50 days, there were...
  ...2 days when Miguel slept between 6 and 6.5 hours.
  ...9 days when he slept between 6.5 and 7 hours.
  ...12 days when he slept between 7 and 7.5 hours.
  ...12 days when he slept between 7.5 and 8 hours.
  ...11 days when he slept between 8 and 8.5 hours.
  ...2 days when he slept between 8.5 and 9 hours.
  ...2 days when he slept between 9 and 9.5 hours.
  
  This means that there were
  2 + 9 + 12 = 23 days when Miguel got less than 7.5 hours of sleep, which are also the 23 days when he got the least amount of sleep because all the other days he got 7.5 hours of sleep or more.
  Comment on Jerry Nilsson's post “The histogram tells us th...”
  (7 votes)
robitaille.alexandre
Posted 5 years ago. Direct link to robitaille.alexandre's post “hey how does this help in...”
hey how does this help in life
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(4 votes)
Answer
- Natalie Luo
  Posted 4 years ago. Direct link to Natalie Luo's post “@robitaille.alexandre it ...”
  @robitaille.alexandre it helps in life because when you are trying to find the average of say, how much you spend in a month, it is easy to calculate.
  Button navigates to signup page
  (5 votes)
rohit.khajuria
Posted 4 years ago. Direct link to rohit.khajuria's post “Mode may also be estimate...”
Mode may also be estimated from a histogram. However, what will be the mode in the above-mentioned example? There are two ADJACENT bars with equal heights. Theoretically, this is a bi-modal set of grouped data. How do we estimate the modes graphically in such a case?
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(2 votes)
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vegacrystal
Posted 3 years ago. Direct link to vegacrystal's post “i have a hard time in thi...”
i have a hard time in this mode for example 2951275?
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(2 votes)
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Lperezobregon
Posted 2 years ago. Direct link to Lperezobregon's post “I'm confused... why the m...”
I'm confused... why the median is calculated from the amount of days tracked by Miguel instead of doing it from the number of hours he slept?
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(2 votes)
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Martin Roy
Posted 3 years ago. Direct link to Martin Roy's post “I'm confused. I'm doing t...”
I'm confused. I'm doing the grade 6 unit test and it asks "In which interval is the median distance?". He doesn't talk about intervals in grade 6. In fact the median in a histogram video above is not in the grade 6 data and statistics unit. What grade is this?
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(2 votes)
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giovani.404259
Posted 3 years ago. Direct link to giovani.404259's post “Are you trying to post a ...”
Are you trying to post a tip or thanks? Check out the Tips & Thanks section above.
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Amanullah Sohail
Posted 3 years ago. Direct link to Amanullah Sohail's post “i have confusion in findi...”
i have confusion in finding median
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(1 vote)
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- Melody
  Posted 3 years ago. Direct link to Melody's post “The mean is all the numbe...”
  The mean is all the numbers added up together, then divided by the number of numbers you added up
  Comment on Melody's post “The mean is all the numbe...”
  (3 votes)

Video transcript

- [Narrator] Miguel tracked how much sleep he got for 50 consecutive days and made a histogram of the results. Which interval contains the median sleep amount? And so they're saying is it this interval on the histogram from six to 6.5, or this one or this one, or any of these. Which of these intervals contain the median. Pause this video and see if you can figure that out. All right now let's work through this together. And let's just remind ourselves how we find the median. If I had the data points 11, nine, seven, three, and two, the way that we find the median is we can order it from least to greatest or actually you could do it from greatest to least, but let's do least to greatest. So two, three, seven, nine, 11. And the median would be the middle number. And I have a clear middle number because I have five data points. If I have an even number of data points, I still would want to order them from least to greatest, so let's say that I have a one, one, three, and a seven. But here, you don't have a clear middle. So the median would be the mean of the middle two numbers. So in this situation, Miguel has an even number of data points. So the median would be the mean of the 25th and 26th data point. These would be the middle two data points. So which interval here contains the 25th and the 26th data point? Well, we can start at the bottom. So we have, actually let's just look at each interval and think about how many data points they have in it. This one has two, this one has nine, this one has 12, and I'm just reading out how many data points there are in each of these intervals. This one has 12, this one has 11, see that there. This one has two and this one has two. So if we look at just this, we have the two lowest, if we look at the two bottom intervals combined we have the 11 lowest. If we look at the three bottom intervals, we have the 11 plus, 12, you have the 23 lowest. So this is the 23 lowest data points. And so the 24th, 25th, 26th, the next 12 data points starting from the bottom, starting from the lowest are going to be in this next interval here. And we care about the 25th and the 26th, so they're definitely going to be in this interval from 7.5 hours of sleep to eight hours of sleep.