Question

the height of 12 boys when measured in centimetre and the result are as follows 141 146 128 135 142 133 139 147 151 145 138 and 145 so how many boys heights more than the mean height​

Answer 1

Step-by-step explanation:

mean = sum of observation/ total no. of observation

= 141+146+128.....+145/12

= 1690/12

= 140.8 approx

Acc to question

there are 7 boys who are above mean height

Answer 2

Answer:

First arranging in ascending order:

128, 133, 135 ,138, 139 141, 142, 145, 145, 146, 147, 151

Mean= sum of all the observations/total no. of observation

1690/12=140.83(approx)

so we will take take the mean(average) as 140cm

Therefore, total 7 boys heights were more than the mean height