Answer to Question #308263 in Statistics and Probability for rylle

Question

Given that the mean weight of senior high school students is 65kg with a standard deviation of 10. What is the percentile rank of a student with a weight of 55 kg?

Answer 1

$z=\frac{55-65}{10}=-1.$

$P(Z<-1)=0.1587.$

Percentile rank is 15.87%.