Statistics Test

Result

Statistics Test - 29

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

The class marks of a distribution are 6, 10, 14, 18, 22, 26, 30 then the class size is

A
4

B
2

C
5

D
8
Question 2
4 / -1

The reciprocal of the mean of the reciprocals of n observations is their

A
A.M.

B
G.M.

C
H.M.

D
None of these
Question 3
4 / -1

The mean weight per student in a group of seven students is 55 kg. If the individual weights of 6 students are 52, 58, 55, 53, 56 and 54; then weights of the seventh student is

A
55 kg

B
60 kg

C
57 kg

D
50 kg

Solution
Question 4
4 / -1

If the algebraic sum of deviations of 20 observations from 30 is 20, then the mean of observations is

A
30

B
30.1

C
29

D
31

Solution
Question 5
4 / -1

The weighted mean of first n natural numbers whose weights are equal to the squares of corresponding numbers is

A

B

C

D

Solution
Question 6
4 / -1

A
1

B
n

C

D

Solution
Question 7
4 / -1

The number of observations in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is

A

B

C
4

D
8

Solution
Question 8
4 / -1

A student obtain 75%, 80% and 85% in three subjects. If the marks of another subject are added, then his average cannot be less than

A
60%

B
65%

C
80%

D
90%

Solution
Question 9
4 / -1

The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is

A
40

B
20

C
80

D
60

Solution
Question 10
4 / -1

The A.M. of a 50 set of numbers is 38. If two numbers of the set, namely 55 and 45 are discarded, the A.M. of the remaining set of numbers is

A
38.5

B
37.5

C
36.5

D
36

Solution