Multiple choice

The mean height of 8 students is 152 cm. Two more students of heights 143 cm and 156 cm join the group. New mean height is equal to

  1. 153 cm

  2. 152.5 cm

  3. 151.5 cm

  4. 151 cm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Initial sum = 8 * 152 = 1216. New sum = 1216 + 143 + 156 = 1515. New mean = 1515 / 10 = 151.5 cm.

AI explanation

The total initial height is the product of the number of students and the mean, giving 8 * 152 = 1216 cm. Adding the heights of the two new students gives a new total of 1216 + 143 + 156 = 1515 cm. Dividing this new total by the new total of 10 students gives 1515 / 10 = 151.5 cm.

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