A sample of 35 observations has the means 80 and SD. As 4. A second sample of 65 observations from the same population has mean 70 and S.D.3. The S.D. of the combined sample is -

A sample of 35 observations has mean 80 men and standard deviation 4. A second sample of 65 observations has mean 70 and standard deviation =3. Find the combined mean and standard deviation.

Mean of 100 observations is 50 and S.D. is 10. If 5 subtracted from each observation and then it is divided by 4, then the new mean and S.D. are

Mean of 100 observations is 50 and S.D. is 10. If 5 subtracted from each observation and then it is divided by 4, then the new mean and S.D. are

Out of total sample survey of 100 nuts, in a first sample survey of 35 items has mean 80 and standard deviation 4. A second sample survey of 65 items has mean 70 and standard deviation 3. Find the mean and variance of combined 100 sample nuts.

A group of 10 observations has mean 5 and 2sqrt(6) another group of 20 observationshas mean 5 and S.D.3sqrt(2) ,then the S.D.ofcombined group of 30 observations is

The mean and S.D. of 1,2,3,4,5,6 is

The mean and S.D. of 1,2,3,4,5,6 is