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Chapter 2: Q 37. (page 109)
If is added to every observation in a data set, the only one of the following that is not changed is
(a) the mean. (d) the standard deviation.
(b) the percentile. (e) the minimum.
(c) the median.
The correct option is (d).
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A Normal curve Estimate the mean and standard deviation of the Normal density curve in the figure below:
Shopping spree The figure below is a cumulative relative frequency graph of the amount spent by
consecutive grocery shoppers at a store.
(a) Estimate the interquartile range of this distribution. Show your method.
(b) What is the percentile for the shopper who spent ?
(c) Challenge: Draw the histogram that corresponds to this graph. 
Use Table A to find the value from the standard Normal distribution that satisfies each of the following conditions. In each case, sketch a standard Normal curve with your value of marked on the axis.
5. of all observations are greater than
Now mark the approximate location of the mean. Explain why the mean and median have the relationship that they do in this case.
The distribution of heights of adult American men is approximately Normal with mean inches and standard deviation of inches. Draw a Normal curve on which this mean and standard deviation are correctly located. (Hint: Draw the curve first, locate the points where the curvature changes, then mark the horizontal axis.)
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