Question

According to the FBI crime statistics from 2022, the average number of cars stolen in the United

States each day is 216 with a population standard deviation of 23.8. Calculate the z score that
could find the probability of a 9 day average being 280.
Round your answer to 2 decimal places as needed.

Answer 1

8.06

Explanation:

z = (x - μ) / (σ / sqrt(n))

Key:

x = sample mean = 280

μ = population mean = 216

σ = population standard deviation = 23.8

n = sample size = 9

Plug in :)

z = (280 - 216) / (23.8 / sqrt(9))

z = 64 / (23.8 / 3)

z = 64 / 7.933

z = 8.06