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probability

The weight of smelt is a normal variable with mean 1.5 ounces and standard deviation of 0.2 ounces. Find the probability that a randomly selected  smelt weighs more than 1.348 ounces.
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1 Answer

First calculate the number of standard deviations:
(1.348-1.5)/.2=-.76
 
Then use Excel to find the probability under a normal distribution curve up to .76 std deviations below average:
normsdist(-.76)=.2236
 
Hope that helps,
Deanna