1. ## Normal distibution

help with b)

a) mean = 31 and s.d = 1.98
b) i dont really know how to use those values to work out an expected value....

thanks.

2. Using what you were told, you get:

$w \sim N(31, 1.98^2)$

Then, find the probability of:

P(25 < w < 27)
P(27 < w < 29)
P(29 < w < 31)
P(31 < w < 33)
P(33 < w < 35)
P(35 < w < 37)

But you'll also see that:
P(29 < w < 31) = P(31 < w < 33)
P(27 < w < 29) = P(33 < w < 35)
P(25 < w < 27) = P(35 < w < 37)

Those are the percentage distributions of the eggs. Multiply by 100 to get the number of eggs.