if the mean of 10 observation is 20 and that of another 15 observation is 16 , find the mean of all the 25 observation
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bunny175:
bro it is 17.6
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mean of 10 observation =20
sum of 10 observation = 20×10
=20
mean of 15 observation =16
sum of 15 observation =15×16
=240
sum of both observation = 200+240
=440
mean=440/25
mean=17.6
sum of 10 observation = 20×10
=20
mean of 15 observation =16
sum of 15 observation =15×16
=240
sum of both observation = 200+240
=440
mean=440/25
mean=17.6
wlcm
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