FIND STANDARD DEVIATION WITH FREQUENCY IS GIVEN WORKSHEET

Problem 1 :

Find the standard deviation of the distribution :

Solution

Problem 2 :

The weights (in kilograms) of 25 calves were measured and the results placed in a table as shown alongside.

a. Find an estimate of the standard deviation by using interval midpoints.

Solution

Problem 3 :

Find the standard deviation of the following test results.

Solution

Problem 4 :

The number of chocolates in 60 boxes was counted and the results tabulated.

Find the mean and standard deviation of the distribution.

Solution

Problem 5 :

The lengths of 30 trout were measured to the nearest cm and the following data obtained :

Find estimates of the mean length and the standard deviation of the lengths.

Solution

Problem 1 :

The weekly wages (in dollars) of 90 workers in a steel yard are given alongside :

Find estimates of the mean wage and the standard deviation of the wages.

Solution

Problem 2 :

A random sample of the weekly supermarket bills for a number of families was observed and recorded in the table given.

a. Find the mean bill and the standard deviation of the bills.

b. variance of the population

Solution

Problem 3 :

The length of 30 randomly selected 12 day old babies were measured to the nearest cm and the following data obtained.

i) Find the mean length and standard deviation of the lengths.

ii) Find the variance.

Solution