Two samples of sizes 50 and 100 are given. The means of these samples respectively are 56 and 50 find the mean of size 150 by combining the two samples.

Two sample sizes of 50 and 100 are given . The mean of these samples respectively are 56 and 50. Find the mean of the size 150 by combining the two samples.

Two sample of sizes 50 and 100 given. The mean of these samples respectively are 56 and 50. Then the mean of size 150 combining is

The mean of two samples of sizes 200 and 300 were found to be 25, 10 respectively. Their standard deviations were 3 and 4 respectively. The variance of combined sample of size 500 is

Two samples of DNA, A and B have melting points 340K and 350 K respectively. This is because

One set of 100 observations has the mean 15 and another set of 150 observation has the mean 16. Find the mean of 250 observation by combining the two sets of given observations.

Two samples of HCl of 1.0 M and 0.25 M are mixed. Find volumes of these samples taken in order to prepare 0.75 M HCl solution. Assume no water is added. (I) 20 mL, 10 mL (II) 100 mL, 50 mL k (III) 40 mL, 20 mL (IV) 50 mL, 25 mL

The mean of two samples is 45. The mean of 1^(st) samples and 2^(nd) samples ware 30 and 50 respectively. Determine the ratio of the number of observations of the two samples.

The daily income of a sample of 50 employees are tabulated as follows. Find the mean daily income of employees.

For two data sets each of size 5 the variances are given by 4 and 5 and the corresponding means are given to be 2 and 4 respectively. Then find the variance of the combined data.

In a mean life of a radioactive sample