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Forty-two cities provided information on vacancy rates (in percent) for local apartments in the following frequency...

Forty-two cities provided information on vacancy rates (in percent) for local apartments in the following frequency distribution.

Vacancy Rate (in percent) Frequency
0 up to 3 9
3 up to 6 5
6 up to 9 10
9 up to 12 6
12 up to 15 12

b. Calculate the variance and the standard deviation for this sample. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.)

math   Statistics-And-Probability   
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Answer #1

This is the case of grouped data . Variance is calculated In the following manner-

0-3 3-6 6-9 a-12 12- .5 13-5 .2s 20 25 4.5 22.5 20 25 101.25 7.5 子5 56.25 562.5 lo. 5 63 o 25 661-5 5 lo 12 3.s 162 (82.25 2 187 42 336 35 32.5 3 5 32.5 (3) 42 = 20.10키 Standad Remiatiin Varlance J 20-1071 44841

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