Math 101 chapter 11

Question

The table shows the​ distribution, by​ age, of a random sample of

3800

moviegoers ages​ 12-74. If one moviegoer is randomly selected from this​ population, find the​ probability, expressed as a simplified​ fraction, that the moviegoer is not in the

12-24

age range.

Answer 1

if it's a uniform distribution

then P (Not 12<x<24) = 1- 24-12)/(74-12) = 1-12/62= 1-6/31= 25/31 = about 81%

if normal distribution, a larger percentage

then x bar = (74-12)/2= 62/2= 31

find z score and calculate the area under the curve

z= (x-xbar)/s, where s= standard deviation

all depends on the table which didn't show up