00:02
All right, we are studying the central limit theorem to sums here.
00:08
And in this problem, we are given the fact that mu of x is 39 .01.
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That's the mean.
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That sigma of x is 0 .5.
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That's the standard deviation.
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And the sample size n is 100.
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If you're using a standard grap and calculator, you're going to use the normal cdf function.
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There are four inputs when you use this function.
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The first is the lower bound.
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The second is the upper bound.
00:48
And then you have the mean and standard deviation of the sums.
00:53
And in this problem, we want to know the probability that the sums are going to be greater than 3 ,900.
00:58
And so that helps us create the bound...