The distribution of mean annual rainfall at 35 stations in the James River Basin, Virginia, is given in the following summary:
Interval (2-in. groupings) | 36 or 37 in. | 38 or 39 in. | 40 or 41 in. | 42 or 43 in. | 44 or 45 in. | 46 or 47 in. | 48 or 49 in. | 50 or 51 in. |
Number of observations | 2 | 4 | 7 | 9 | 5 | 4 | 2 | 2 |
Compute the relative frequencies and plot the frequency distribution and the cumulative distribution. Estimate the probability that the mean annual rainfall (a) will exceed 40 in., (b) will exceed 50 in., and (c) will be between these values.
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