Statistics Test

Result

Statistics Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

In a frequency distribution, C= 3, l = 66.5, t =42, m = 23 n = 102. Find the median of the distribution.

A
65.5

B
68.5

C
66.9

D
67.5
Question 2
1 / -0

The mean of a data is 'P'. If each observation is multiplied by 3 and then 1 is added to each result, the mean of the new observations so obtained is

A
P

B
3p

C
p + 1

D
3p + 1

Solution

Mean = 3p + 1
Question 3
1 / -0

The mean of 20 observations is p. If each observation is multiplied by 3 and then 1 is added to it, the new mean obtained will be

A
3p + 20

B
p + 20

C
3p + 1

D
3(p + 1)

Solution

Mean of 20 observations is p.
So, sum of the observations will be 20p.
When each observation is multiplied by 3, the mean will become (3 x 20p)/20
When 1 is added to each observation, new mean will be (20 + 60p)/20
So, new mean obtained after multiplying each observation by 3 and adding 1 to it = (20 + 60p)/20 = 3p + 1.
Question 4
1 / -0

The median and A.M of a unimodel data are 30.5 and 26.2 respectively. Find its mode.

A
31.2

B
35.1

C
40.4

D
39.1

Solution

Mode = 3 Median – 2 Mean
= 3 × 30.5 - 2 × 26.2
= 91.5 - 52.4
= 39.1
Question 5
1 / -0

The arithmetic mean of a - 2, a and a + 2 is

A
a + 2

B
a - 2

C
a

D
3a

Solution

A.M = (a - 2 + a + a + 2)/3 = a
Question 6
1 / -0

One of the properties of mode is

A
not easy to calculate

B
not affected by the greatest and the least values

C
algebraic

D
difference of the greatest and the least values

Solution

Mode is a value which appears most often in a set of data and is independent of the greatest and least values.

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Re-Attempt Weekly Quiz Competition

Statistics Test - 2

Result

Statistics Test - 2

Score

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Rank

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SHARING IS CARING

Question 1

65.5

68.5

66.9

67.5

Question 2

P

3p

p + 1

3p + 1

Solution

Question 3

3p + 20

p + 20

3p + 1

3(p + 1)

Solution

Question 4

31.2

35.1

40.4

39.1

Solution

Question 5

a + 2

a - 2

a

3a

Solution

Question 6

not easy to calculate

not affected by the greatest and the least values

algebraic

difference of the greatest and the least values

Solution

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