Answer
$z = \frac{x-μ}{σ} = \frac{225-205}{37.8}$ = 0.33
$z = \frac{x-μ}{σ} = \frac{260-205}{37.8}$ = 1.46
Using table 4, we have:
a. P(z < 0.53) = 0.7019 = 70.19%
b. P(z > 1.46) = 1 = P(z < 1.46) = 1 - 0.9279 = 0.0721 = 7.21%
To get number of scores, we multiply sample size and percentage
7.21% x 250 ≈ 18 individuals
Work Step by Step
As given above