Given,
= 11.4 , = 2.9
We convert this to standard normal as
P(X < x) = P(Z < x - / )
a)
P(X > 13) = P(Z > (13 - 11.4) / 2.9)
= P(Z > 0.55)
= 0.2912
b)
P(X < 15) = P(Z < (15 - 11.4) / 2.9)
= P(Z < 1.24)
= 0.8925
c)
P(10 < X < 12) = P(X < 12 ) - P(X < 10)
= P(Z < (12 - 11.4) / 2.9) - P( Z < (10 - 11.4) / 29)
= P(Z < 0.21) - P(Z < -0.48)
= 0.5832 - 0.3156
= 0.2676
Baby weights: The weight of male babies less than 2 months old in the United States...
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