Statistics Test

Result

Statistics Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

The most frequent value in the data is known as

A
mode

B
mean

C
all the three

D
median

Solution

The most frequent value in the data is known as the Mode.

e.g let us consider the following data set: 3,5,7,5,9,5,8,4

the mode is 5 , since it occurs most often in data set.

Question 2

1 / -0

The percentage of marks obtained by 100 students in an examination are as follows:

Marks	30-35	35-40	40-45	45-50	50-55	55-60	60-65
Frequency	14	16	18	23	18	8	3

The median class is

45 – 50

40 – 45

none of these

50 – 55

Solution

Marks	30-35	35-40	40-45	45-50	50-55	55-60	60-65
Frequency	14	16	18	23	18	8	3
Cumulative Frequency	14	30	48	71	89	97	100

Here N = 100
⇒ N/2 = 50
Therefore, Median class is 45 – 50.

Question 3

1 / -0

The percentage of marks obtained by 100 students in an examination are as follows:

Marks	130-135	135-140	140-145	145-150	150-155	155-160	160-165
Frequency	14	16	18	23	18	8	3

The cumulative frequency of the class interval 140 – 145 is

50

48

52

40 Solution

Marks	130-135	135-140	140-145	145-150	150-155	155-160	160-165
Frequency	14	16	18	23	18	8	3
Cumulative Frequency	14	30	48	71	89	97	100

Therefore, the cumulative frequency of the class interval 140 – 145 is 48.

Question 4
1 / -0

The measure of central tendency that can be obtained graphically is

A
mode

B
median

C
none of these

D
mean

Solution

The measure of central tendency that can be obtained graphically is Median.

The median is less affected by outliers and skewed data distribution i.e. when the distribution is not symmetrical.