Question

Sally’s score in her math class is 80 and her class has a mean

score of 75 with the standard deviation of 10. What percent of her
classmates has higher score than Sally?
Show steps and hand calculat

Answer 1

Explanation:

Sal's score is points above the mean

this is 1/2 of a standard deviation ABOVE the mean

z-score = +.500

from z-score table , this corresponds to 69.15 per centile

so 100 -69.15 = 30.85 percent scored higher than her

30.85 percent of 80 classmates = approx 25 scored higher