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Hi,My question is about finding the area under a normal curve.

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Question

Hi,My question is about finding the area under a normal curve. I have these 2 examples from my text and I

dont get when you add and when you subtract.

Question 1

Find the area between .-88 standard deviations below the mean and 2.35 standard deviations above the mean.

’88=.3106 and 2.3=.4906 Both figures are added .3106+.4906= .8012 which is 80.12%

Question 2

The area between .58 standard deviations above the mean and 1.94 standard deviations above the mean

.58=.2190 and 1.94=.4738. Here they minus .4738-.2190=.2548 which is 25.48%

 
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