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) 25%
B) 77.3%
C) 75%
D) 22.7%
E) none of these

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 less than -0.75 is approximately 22.7%.

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