[" 16A 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 "]

The marks of a student in 6 tests are 41,45,54,57,43 and x. If the meen marks of these test is 48 .then standard deviation of these tests is

Calculate the mean of the scores of 20 students in a mathematics test

Calculate the mean of the scores of 20 students in a mathematics test

The marks scored by Rohit in two tests were 65 and 70. Find the minimum marks he should score in the third test to have an average of at least 65 marks.

On a test that has a normal distribution of scores of 59 falls two standard deviations below the mean, and score of 74 is one standard deviation above the mean. If x is an integer score that lies between 2.5 and 3.0 standard deviations above the means. What is a possible value of x?

A student's mean score on 5 tests was 84. The student's mean score on the first 4 of these tests was 87. What was the student's score on the fifth of these tests ?