In a class of 20 students the scores in a Mathematics test out of 10 marks are as follows:
5, 3, 6, 7, 8, 4, 5, 4, 9, 3, 4, 6, 4, 5, 7, 4, 5, 6, 7, 2

The range of the distribution is

The following marks were obtained by candidates in an examination 

Calculate the third quartile

The scores of students in a class test are given in the table below:

Marks             1     2     3    4    5     6    7    8    9    10
Frequency     0     3     1    2    3     4    2    1     1     0

The modal score is

The variance and standard deviation of the set of numbers
-4, -2, 0, 2, 4 are, respectively

The mean of 25 numbers is 8. If the largest value 32 is removed, what is the mean of the remaining numbers?

Find the mean and  mean deviation, respectively of the following 
16, 18, 12, 14, 20, 25, 13, 15, 11

The table below shows the weight distribution of a group of potatoes.

Weight(g)             1-5        6-10        11-15        16-20          21-25
No. of potatoes      3             7              5                3                  2

What is the mode of the distribution?

The average age of 4 children is 15 years. If the ages of their parents are added, the average age is 25.
What is the age of the father if he is 4 years older than his wife?

For the set of numbers
4, 6, 2, 10, 8,
the difference between the range and the variance is

The diagram shows the distribution of the number of candidates offering Biology(B), Goegraphy(G), Economics(E), French(F) and History(H) in a school certificate class of 60 students. The number of candidates offering Economics is

The scores of students in a class test are given in the table below:

Marks             1     2     3    4    5     6    7    8    9    10
Frequency     0     3     1    2    3     4    2    1     1     0

The mean score is

Find the mean and  mean deviation, respectively of the following 
5, -3, 6, -2, 4, -8, 4, 7, -10, 10

The scores of a class of students in a test are shown below:

Scores                     2        3       4     5      6        7
No. of students      1         3       5     x      4        2

If the average score is 14/3, the value of x is

The pie chart illustrates the distribution of number of married men (M), married woman (W), bachelors(B), spinsters(S) and children(C) at a social event.



The angle representing the total number of married persons is

If x is positive, and the standard deviation of x-1, x+1, 3, 2x-1 and x+3 is 2√2, find the value of x and hence calculate the mean deviation

The table below shows the masses to the nearest kg of a group of market women.



The median of the distribution is

he frequency table of the monthly salaries of 20 people is shown below. 

The scores of a group of five students are
4, 5, 6, 7, 8.
The mean deviation is

The prices of computers in a catalogue are: N125,000,  N99,000,  N125,000,  N120,000,   N110,000,  N115,000,   N130,000,  N120,000,   N100,000.
Calculate the mean deviation

The following marks were obtained by candidates in an examination 
Calculate the 42nd percentile

The marks scored by students in a test are recorded in the table below

Calculate the standard  deviation

The mean age of a class of twenty school pupils is 12.
If their teacher's age is included, the mean becomes 13.
The age of the teacher is

The table below shows the frequency distribution of a number of pets in 25 houses 



Find the mean of the distribution

The weights to the nearest kg of a group of students are recorded in the following table

Calculate the difference between the mean deviation and the standard deviation

In an experiment, the mean of 25 observations was 6.
One of the observations, which has the value of 30, was cancelled.
The mean of the remaining observations is