Question

A-)the mean height of 8 students is 152cm. Two more students of heights 143cm and 156cm join the group. What is the new mean height?

Answer 1

#BAL

Given mean of 8 students is 152 cm

Recall that, mean = sum of obeservations / Number of observations

152 = sum of obeservations / 8

Hence the sum of observations = 152 × 8 = 1216 cm

Given that two more students of heights 143 cm and 156 cm joined the group.

Hence new sum of observations = 1216 + 143 + 156 = 1515 cm

∴ New mean height = 1515/10 = 15.15 cm