Calculate the arithmetic mean of following frequency distribution.
250-300
200-250
Class-Interval
0-50
50-100
100-150
150-200
200-250
250-300
Frequency
20
40
45
40
25
30
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Class intervalMid value
xi Frequency
fifixi cf 0−5035 2 50 2 50−10075 3 225 5 100−150125 5 625 10 150−200175 6 1050 16 200−250225 5 1127 21 250−300275 3 825 24 300−350325 1 325 25 ∑fi=25 ∑fixi=4225 ⇒ Mean=∑fi∑fixi=254225=169
⇒ We have N
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