+0  
 
0
77
1
avatar+558 

Use technology or a z-distribution table to find the indicated area.

The ages of visitors to a theme park are normally distributed with a mean of 15 years and a standard deviation of 5.2 years.

Approximately 70% of the visitors to the theme park are older than which age?

 

11.4

12.3

17.7

18.6

SamJones  May 22, 2018
 #1
avatar+86859 
+1

We are looking for the z score that corresponds with [ 1 - .70]   =  .30.....the closest value [per table]  is about -.52

 

So...we are trying to solve this

 

[ x  -15  ]  / 5.2  =  -.52       multiply both sides by 5.

 

 x - 15  =  -2.704  add 15 to both sides

 

x  = 12.296  = 12.3 years of age

 

 

cool cool cool

CPhill  May 22, 2018

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