3.
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
5.
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
6.
Find the mean and mean deviation, respectively of the following
5, -3, 6, -2, 4, -8, 4, 7, -10, 10
8.
Find the mean and mean deviation, respectively of the following
16, 18, 12, 14, 20, 25, 13, 15, 11
9.
For the set of numbers
4, 6, 2, 10, 8,
the difference between the range and the variance is
10.
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
12.
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?
13.
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
14.
Find the variance and the standard deviation, respectively of the data below
5, -3, 6, -2, 4, -8, 4, 7, -10, 10
15.
The scores of a group of students are
4, 5, 6, 7, 8.
The standard deviation is
16.
The distribution of a housewife's expenditure on four food items is as follows:
Item A (£80), Item B (£45), Item C (£30), Item D (£25).
The sum of the angles of the sectors representing the expenditure on items B and D is
17.
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 scored at least 5 is
19.
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?
20.
The following are measures of central tendency except
21.
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
22.
Four angles of the sectors of a pie are 84°, 72°, 56° and 78°. If the fifth sector represents a population of 1.6 million, what population will the sector with 56° represent?