100 surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of lettersin the English alphabetsin the surnames was obtained as follows :

Determines the median number of letters in the surnames. Find the mean number of letters in the surnames? Aso, find the modal size of the surnames.

100 surnames were randomly picked up from a local telephone directory and a frequency distribution of the number of lettes in te english alphabet in the surnames was found as follows Write the class interval in which the minimum number of surnames lie.

100 surnames were randomly picked up from a local telephone directory and a frequency distribution of the number of letters in the English alphabet in the surnames was found as follows : : Draw a histogram to depict the given information.

100 surnames were randomly picked up from a local telephone directory and a frequency distribution of the number of letters in the English alphabet in the surnames was found as follows : : Write the class interval in which the maximum number of surnames lie.

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.