Because a BMI value for a child depends on age and sex of the child, ???? scores are often used to compare children of different ages or sexes. Table 2.19 gives the mean and standard deviation for the distribution of BMI values for male children aged 10 and 15. Use the information in Table 2.19 to answer the following questions concerning two male children, a 10 and a 15 years old, each having a BMI value of 25:

(a) Compute the ???? score for the 10-year-old.

(b) Compute the ???? score for the 15-year-old.

(c) Which child has a larger BMI value relative to the population of males in their age group?