A study of college students stated that 25% of all college students have at least one tattoo. In a random sample of 80 college students, let x be the number of the students that have at least one tattoo. Find the approximate probability that more than 17 and less than 26 of the sampled students had at least one tattoo.
A) 0.1800
B) 0.6644
C) 0.4222
D) 0.2422 3 Find Mean, Standard Deviation, z-Score

Question

Quizplus · Accepted Answer

The mean is 20 (80 * 0.25) and the standard deviation is 3.87 (sqrt(80 * 0.25 * 0.75)). Using the normal approximation, calculate the z-scores for 17.5 and 25.5, then find the probability between these z-scores.

A Study of College Students Stated That 25% of All