Statistics Test

Result

Statistics Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

One of the sides of a frequency polygon is

A
the x-axis

B
the y-axis

C
either of the coordinate axes

D
neither of the coordinate axes

Solution

In frequency polygon x-axis repesents data value whereas y-axis is used represent the frequencies of the data.

We include one class below lowest value and one class above highest value with zero frequencies. The graph touches the x-axis at these points.

So, one sides of the frequency polygon is x-axis.
Question 2
1 / -0

Which of the following is not a measure of central tendency ?

A
Mean

B
Median

C
Mode

D
Standard deviation

Solution

A measure of central tendency is a single value that attempts to describe a set of data.

Mean, median & mode are the measures of central tendency.

Standard deviation is not the measure of central tendency
Question 3
1 / -0

The mean of first four prime numbers is

A
4.5

B
3.75

C
4

D
4.25

Solution

The mean is equal to the sum of all the values in the data set divided by the number of values in the data set.

sum of first 4 prime numbers is 17

so mean is 17/4=4.25
Question 4
1 / -0

If each observation of the data is increased by 3, then their mean

A
is decreased by 3

B
becomes 3 times the original mean

C
remains the same

D
is increased by 3

Solution

Since mean is equal to the sum of all the values in the data set divided by the number of values in the data set.

so increase in the value of each observation will also increase the mean( average) by 3