The following data pertain to a sample pertain to a sample containing 5 items:`sum X= 15, sum X^2 = 55 `, then the variance of the sample is

Among the following samples, select the sample which contains maximum number of atoms.

Among the following samples, select the sample which contains maximum number of atoms.

The following information relates to a sample of size 60: sum x_i^2 = 18000, sum x_i = 960 . The varience ……..

The following information relates to a sample of size 60 : sum x^(2) = 18000, sum x = 960 . The variance is :

25 gm of an oleum sample contains 15 gm H_(2)SO_(4) . What is % labellling of this oleum sample-

The screws produced by a certain machine were checked by examining samples of 7. The following table shows the distribution of 128 samples according to the number of defective items they contained. No. of defectives in a sample of 7 is : {:(,:,0,1,2,3,4,5,6,7),("No of samples" :,:,7,6,19,35,30,23,7,1):} N = 128. Fit a binomial distributtion and find the expected frequencies if the chance of screw being defective is (1)/(2) . Also find the mean and variance of the fitted distribution.

A water sample contains 1 millimole of Mg^(2+) ion per litre. calculate the hardness of water sample in ppm unit.

A water sample contains 1 millimole of Mg^(2+) ion per litre. Calculate the hardness of the water sample in ppm unit.

One kilogram of a sea water sample contains 6 mg of dissolved O_(2) . The concentration of O_(2) in the sample in ppm is

The screws produced by a certain machine were checked by examining samples of 7. The following table shows the distribution of 128 samples according to the number of defective items they contained. Fit a binomial distribution and find the expected frequencies if the chance of screw being defective is 1/2 . Also find the mean and variance of the fitted distribution.