10-19 20-29 30-39 40-49 50-59 60-69 70-79 frequency
no 8 19 29 36 25 13 4
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1
Answer:
172.28
Explanation:
10-19 9 8 72
20-29 9 19 171
30-39 9 29 261
40-49 9 36 324
50-59 9 25 225
60-69 9 13 117
70-79 9 4 36
--------------------------------------
63 134 1206
mean= 1206/7= 172.28
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