The Weight of a Goose Probability

A field biologist grabs geese and weighs them. He finds out that the weights of the geese are normally distributed with a mean of 9 pounds and a standard deviation of 1.3 pounds. What then, is the probability that one of these geese snatched at random will weigh less than 10.5 pounds?

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...)/1.3=1.1538

So P(X<10.5)=P(Z<1.1538)

From the normal tables we ...