Posted by **Becky** on Friday, March 23, 2012 at 2:15am.

The weights of adult long-tongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will:

a) weigh at most 15 grams?

b) weigh less than 30 grams?

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