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Suppose that the body weights of lemmings are normally distributed with a mean of 63.8g and...

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Basic Math

Suppose that the body weights of lemmings are normallydistributed with a mean of 63.8g and a standard seviation of12.2g.

(a) What proportions of lemmings weigh more than 90g ?

(b)What proportion of lemmings weigh between 40 and 90 g?

(c)We can say that 99% of lemmings weigh more than ____ g.

(d)In a random sample of 20 lemmings what is the probabilitythat exactly 3 weigh more than 90g ?

Answer & Explanation Solved by verified expert
4.3 Ratings (721 Votes)
SolutionGiven the body weights of lemmings are normally distributedwith a mean of 638g and a standard deviation of 122gthus andPart a What proportions of lemmings weigh morethan 90g That is findP X 90 Find z score for x 90thus we getP X 90 P Z 215P X 90 1 P Z 215Look in z table for    See Answer
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