The length of a cat's tail is roughly normally distributed with a mean of 5" and a standard deviation
Of 2". The probability of having a cat with a 3.5" tail or shorter is…
A) 77.3%
B) 75%
C) 25%
D) none of these
E) 22.7%

Question

Quizplus · Accepted Answer

The z-score for a 3.5" tail is (3.5 - 5) / 2 = -0.75. Using the standard normal distribution table, the probability of a z-score being -0.75 or less is approximately 22.7%.

The Length of a Cat's Tail Is Roughly Normally Distributed