Question

Select the correct answer.
Four bell-shaped curves, each divided into 6 vertical sections, are shown where in A the first two sections from left are shaded. In B, the three right sections are shaded, in C, Sections 3 to 5 are shaded and in D the left three sections are shaded.

The average hourly salary of workers at a supermarket is $14.50 with a standard deviation of $1.75. The shaded area of which curve represents the probability of the hourly salary being between $9.25 and $12.75?

A.
A
B.
B
C.
C
D.
D
Reset

Answer 1

Compute z-scores: z = (x - 14.50)/1.75. For x = 9.25, z = -3.0; for x = 12.75, z = -1.0. So we want the area between z = -3 and z = -1, i.e. the first two leftmost sections. That is curve A.