A city in the Pacific Northwest recorded its highest temperature at 91 degrees F

Question

A city in the Pacific Northwest recorded its highest temperature at 91 degrees Fahrenheit and its lowest at 12 degrees . Use this information to find the upper and lower limits of the first class of you wish to construct a frequency distribution with 10 classes.
A city in the Pacific Northwest recorded its highest temperature at 91 degrees Fahrenheit and its lowest at 12 degrees . Use this information to find the upper and lower limits of the first class of you wish to construct a frequency distribution with 10 classes.

Explanation / Answer

Highest temperature h=91

Lowest temperature l=12

Width d=91-12=79

Now we have number of classes n=10

Hence width of single class =d/n=79/10=7.9

Hence we can take width of single class =8 which is very near to 7.9

First class is [12,12+7.9]=[12,19.9)

Second class is [19.9,27.8)=[19.9,27.8)

Third class is [27.8,27.8+7.9)=[27.8,35.7)

Similarly

4th is [35.7,43.6)

5th is [43.6,51.5)

6th is [51.5,59.4)

7th is [59.4,67.3)

8th is [67.3,75.2)

9th is [75.2,83.1)

10th is [83.1,91]..

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