Question

If the class intervals are 140 to 145, 145 to 150, 150 to 155, 155 to 160 and 165 to 170 And The frequencies are 10, 8, 20, 12, 6, 4 then find the less than ''cumulative frequency.''

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Answer 1

Answer:

Now n = 51. S0, n/ 2 = 51/ 2 =25.5 this observation lies in the class 145 – 150 Then, L (the lower limit) = 145 cf (the cumulative frequency of the class preceding 145 – 150) = 11 f (the frequency of the median class 145 - 150) = 18 h (the class size) = 5 Using the formula,

We have Median = 145 + 72.5/ 18 = 149.03 So, the median height of the girls is 149.03 cm This means that the height of about 50% of the girls in less than this height, and 50% are taller than this height.

Answer 2

Answer:

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