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1) 1.07 standard deviations below the mean
)) 1.5 standard deviations below the mean
1.5 standard deviations above the mean
1) 1.07 standard deviations above the mean

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03:17

70th percentile =Value that is 2 standard deviations above the mean =Value that is 1.5 standard deviations below the mean =

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1. A normal distribution of scores has a standard deviation of 10. Find the z-scores corresponding to each of the following values: A score that is 15 points above the mean.

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IQs are normally distributed with a mean of 100 and a standard deviation of 15. Determine the percentage of IQ scores which are less than 115 , to the nearest whole number.

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5. About what percentage of the area under the normal distribution curve falls within 1 standard deviation above and below the mean? 2 standard deviations? 3 standard deviations?

Transcript

It looks like we want to know the values below the curve of the probability of having how many but the probability of having values this number of standard deviations, above or below the mean, and so to do that. We’Re going to look at the z scores which will correspond to the standard deviations. However, if it says below the means like it does in number 1 and number 2, then we’re gonna be looking at negatives. These scores- if this is…