Assume the random variable x is normally distributed, with p = 3.5 and a = 1....

Question

Question

Answer 1

Answer #1

Ans ) 0.625

Formula to calculate z-score:

$z = \frac{x-\mu}{\sigma}$

$P(2<x<4) =P(z < \frac{4-3.5}{1})-P(z < \frac{2-3.5}{1})$

=P(z < 0.5)-P(z < -1.5)

=0.6915-0.0668

$=0.6247\approx 0.625$ ans.

Answer 2

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