Mean Questions

What is the mean deviation of first 10 even natural numbers?

The frequency distribution of the marks obtained by students in a Science examination is given below: 

Direction for Questions (95-96): Consider the following for the two (02) items that follow: The sum and the sum of squares of the observation corresponding to length X (in cm) and weight Y (in gm) of 50 tropical tubers are given as ∑X = 200, ∑Y = 250, ∑X² = 900 and ∑Y² = 1400.

 Which one of the following statements is correct?

What is the arithmetic mean of 8², 9², 10²,... 15²?

The arithmetic mean of 100 observations is 50. If 5 is subtracted from each observation and then divided by 20, then what is the new arithmetic mean?

The mean of the series x₁, x₂, x_n is x. If x_n is replaced by k, then what is the new mean?

Let . If M is the mean and s is the standard deviation of x₁, x₂,..., x₉, then what is the value of M² +s²?

What is the mean deviation of the first 10 natural numbers?

The mean of n observations 1, 4, 9, 16, ···, n² is 130. What is the value of n?

Consider the following for the next two (02) items that
follow:
The marks obtained by 10 students in a Statistics
test are 24, 47, 18, 32, 19, 15, 21, 35, 50 and 41

What is the mean deviation of the largest five observations?