Calculating the test statistic in a z test for a proportion

Jake heard that spinning—rather than flipping—a penny raises the probability above $50\%$50, percent that the penny lands showing heads. He tests this by spinning $10$10 different pennies $10$10 times each, so he's willing to treat these spins as a random sample. In his $100$100 spins, the penny landed showing "heads" in $68$68 spins. He wants to use these results to test $H_0: p=0.50$H, start subscript, 0, end subscript, colon, p, equals, 0, point, 50 versus $H_\text{a}: p>0.50$H, start subscript, start text, a, end text, end subscript, colon, p, is greater than, 0, point, 50, where $p$p is the true proportion of spins that a penny would land showing "heads".

$z=$z, equals