The average weight of a person in a group is 60kgs with a standard deviation of 15kgs. Then assuming the data is normally distributed, which is correct atleast 68% of the people will have weights in between 45 and 75 kgs. All of these half of the people will have weight more than 60 kgs. Atleast 95% of the people will have weights between 30 and 90 kgs.
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Average weight of a people in the group is = 60 kg ......................(given)
Total weight of the people in the group
=720 kgs .........................(given)
FIND THE NUMBER OF PEOPLE IN THE GROUP:
number of people =720 ÷60= 12
answer = 12
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