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Answer on Statistics and Probability Question for dustin hanshaw

Question #8379
Find the area under the standard normal curve to the left of z = 1.31
Expert's answer
Let X be a random variable which have standard normal distribution, i.e. mean=0,
and variance=1.
Then the area under the standard normal curve over the
interval [a,b] is equal to the probability
P(X belongs to

In particular, the area under the standard normal curve to the
left some value t is equal to

The function F:R -> R
defined by
F(t) = P(X<z)
is called cummulative probability
distruibution and its vaules can be found in almost all books in Probability

We should find F(1.31).
In Excel one can use the function
F(1.31) = P(X<1.31) = NORMSDIST(1.31) = 0.9049

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