Answer
Using Table A to determine the z score corresponding to the probability of 0.95:
z = 1.645
Corresponding value of x is given by
x = μ + zσ
= 21 + 1.654 (3)
= 25.935 minutes
Work Step by Step
Using Table A to determine the z score corresponding to the probability of 0.95:
z = 1.645
Corresponding value of x is given by
x = μ + zσ
= 21 + 1.654 (3)
= 25.935 minutes