Question

The graph below depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15.

Answer 1

Given : population mean (N) = 100
population stal dov ( 6) = 15
formula : x = pt ( Z * 6 )
P ( 2 7 ? ) = 0'65
Refer to standard normal table lZ table
looking up for Z-score corresponding to
area
0 65 to the right of
the
normal
curve to find the I-score
P LZ > - D : 39 ) = 6.65
2 = - 0:39
DX = 100 + ( - 0 39 x 16 )
= loot - 5:65
2 94:15
Rounded to one decimal place
X = 94 . 2