Answer:
-240
Step-by-step explanation:
You want a85.
Work it out step by step:
a85 = 12 + (85 - 1)(-3)
Subtract 1 from 85.
a85 = 12 + 84(-3)
Multiply the numbers in the brackets.
a85 = 12 + -252
Add 12.
a85 = -240
Transform M to the standard normally distributed random variable Z via

where
and
are the mean and standard deviation for
, respectively. Then

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