Find the indicated IQ score The graph to the right depicts I

Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15.

LOADING...

LOADING...

xx

0.99

The indicated IQ score, x, is

nothing.

(Round to one decimal place as needed.)

Solution

First, we get the z score from the given left tailed area. As          
          
Left tailed area =    0.99      
          
Then, using table or technology,          
          
z =    2.33      
          
As x = u + z * s,          
          
where          
          
u = mean =    100      
z = the critical z score =    2.33      
s = standard deviation =    15      
          
Then          
          
x = critical value =    134.95 = 135.0 [ANSWER]