The data show the maximum wind speeds in miles per hour recorded for 40 states. Construct a frequency distribution using 7 class
es.
2 answers:
Answer:
Step-by-step explanation:
We have to construct a frequency distribution table using 7 classes.
1. Find the difference between the maximum wind speed and the minimum wind speed first.
93 - 48 = 45
2. Divide this difference by number of class.
= 6.42
3. Round up this number.
6.42 ≈ 7
4. Add this number to the lowest number in the given table.
48 + 7 = 55
5. By repeating this step we can get 7 classes.
48
48 + 7 = 55
55 + 7 = 62
62 + 7 = 69
69 + 7 = 76
76 + 7 = 83
83 + 7 = 90
These are the lower limits of the interval.
6. Now we will write down the upper limits of the intervals.
48 + ( 7 - 1) = 54
48 - 54
Similarly we can write all other intervals.
55 - 61
62 - 66
67 - 73
74 - 80
81 - 87
88 - 94
7. Now we can easily form the frequency table.
Wind speed Number of states
48 - 54 3
55 - 61 4
62 - 66 5
67 - 73 12
74 - 80 12
81 - 87 3
88 - 94 1
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