Posted by **vanessa** on Monday, April 7, 2014 at 5:13pm.

Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals).

P(z -1.0)

P(z -1.0)

P(z -1.5)

P(z -2.5)

P(-3 < z 0)

- statistics -
**Kuai**, Monday, April 7, 2014 at 5:48pm
P(z <-1.0) = 0.1587

P(z <-1.5) = 0.0668

P(z <-2.5) = 0.0062

P(-3 < z < 0) = 0.500-0.0013

- statistics -
**leanah**, Tuesday, April 15, 2014 at 9:42am
Jim Tree sells Christmas trees. The mean length of the trees purchased was 68 inches with a standard deviation of 10 inches. Jim wants to know what per cent of his sales were more than 84 inches tall. He can use the standard normal distribution to help him.

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