The standard derivation of 5 scores 149,150,151,152,153 is

Find the variance and standard deviation of the scores 7 , 8 , 9 , 10 and 16.

For a group of 200 candidates, the mean and standard deviation of scores were found to be 40 and 15 respectively. Later on if was discovered that the scores of 43 and 35 were misread as 34 and 53 respectively. Find the correct mean and standard derivation corresponding to the correted figures.

If the heights of 5 persons are 140 cm, 150 cm, 152 cm, 158 cm and 161 cm respectively, find the mean height.

If the heights of 5 persons are 140cm,150cm,152cm,158cm and 161cm respectively,find the mean height.

A student scores the following marks in five tests 45, 54, 41, 57, 43. His score is not known for the sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is