In a frequency distribution, the first class interval begins at 18. The midpoint of the first class interval is 19.5, and the midpoint of the last class interval is 49.5. How many class intervals are there? A. 11 B. 17 C. 22 D. 33 E. 34
mid point = (lower limit + upper limit )/2 = 19.5
(18+ upper limit)/2 = 19.5
upper limit = 21
so, first class interval is (18-21)
so, class width =21-18=3
so, other mid point will be
19.5
22.5
25.5
28.5
31.5
34.5
37.5
40.5
43.5
46.5
49.5
hence, total intervals = 11
In a frequency distribution, the first class interval begins at 18. The midpoint of the first...
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