If the mean of 10 observation is 20 and that of another 15 observation is 16 . Find the mean of all the 25 observation.Please help me please please please please
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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
harshthebeast2004:
How did u get mean =440/25
sum of both the observation is 440
And 25??
20×10=200
Answer me sis
Plz
it is the total no. of observation
Thanks there
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