The diagram illustrates the distribution of marks in a class test



The average and the modal marks scored are, respectively

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

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

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

The total income of a household for one year is N60,000. This amount is spent on rent(R), food(F), education for the children(E), general maintenance(G) and miscellaneous items(M).
What is the amount spent on food items

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

Calculate the standard  deviation

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 standard deviation

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

Find the variance and the standard deviation, respectively of the data below
16, 18, 12, 14, 20, 25, 13, 15, 11

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 number of students who took the test is

Find the range of the following data
1/4, 5/8, 3/10, 2/5, 7/10, 7/8, 3/4

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

The mean of the distribution is

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 median score is

The distribution of grades in a Mathematics examination taken by a class of 72 students is represented on a pie chart.
If the angle of the sector representing the number of students who scored the A grade is 30°,
the actual number of A grades scored is

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

Calculate semi interquartile range

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 average age of the three children in a family is 9 yr.
If the average age of their parents is 39 yr,
the average age of the whole family is

The heights of eight children are:
1 m, 1.2 m, 0.9 m, 0.8 m, 1.4 m, 0.8 m, 1.2 m and 1.1 m.
The sum of the mean and the range is

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

The pie chart below shows the distribution of the expenditure of a household on various food items in a certain month. If N200 was spent on fruits, how much was spent on rice?

The following marks were obtained by candidates in an examination 

Calculate the third quartile

The table below shows the frequency distribution of marks scored by students in a class test:

Score                1               2               3               4               5
Frequency      x+2         x-1           2x-3         x+4          3x-4       

If the average score is 43/14, how many students scored 3 points?

Find the variance and the standard deviation, respectively of the data below
5, -3, 6, -2, 4, -8, 4, 7, -10, 10

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 mode of the scores is

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



Find the mode of the distribution