Find the mean,variance and standard deviation
C.I. 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100
Freq 18 16 8 15 12 10 15 2 3 1
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/find-the-mean-variance-and-standard-deviation-using-shor/statistics/11793283
Regards
https://www.meritnation.com/ask-answer/question/find-the-mean-variance-and-standard-deviation-using-shor/statistics/11793283
Regards