Question

the mean height of 8 students is 152 CM. 3 more students of height 160 cm 165 cm and 164 CM join the group find the new mean height​

Answer 1

Given;

mean = 152

We know that mean = Σxi / N

thus we can say that ;

• 152 = Σxi/8
• Σxi = 1216

Thus according to the new data;

• Σxi = 1216 + 160 + 165 + 164 = 1705
• N = 8 + 3 = 11

Thus new mean = Σxi/N

• mean = 1705/11
• mean = 155

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