Data Handling Test

Result

Data Handling Test - 2

Score
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Rank
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Weekly Quiz Competition

Question 1
1 / -0

Rajani has a box with 6 marbles numbered from 1 to 6 on each of them. She picks a marble from it without seeing. What is the probability that the marble picked has the number 3 on it?

A
1/6

B
2/3

C
3/4

D
1/4

Solution

Each of the 6 marbles has an equal chance of being picked. So, the probability that the marble picked is 3 will be 1 out of 6 i.e. 1/6
Question 2
1 / -0

Which of the following is true about mean?

A
It occurs most frequently.

B
It divides observations into two equal parts.

C
It is representative of the whole group.

D
It is the sum of observations.

Solution

Mean is representative of whole group.
Question 3
1 / -0

The arithmetic mean of five given numbers is 85. What is their sum?

A
425

B
85

C
A number between 85 and 425

D
A number greater than 500.
Question 4
1 / -0

Soni has digit cards 1, 4 and 7. She makes 2-digit number using each card only once. The probability that a 2-digit number chosen at random is divisible by 2 Is:

A
1/3

B
2/3

C
0

D
1/2

Solution

Two digit numbers using the digits 1, 4 and 7 are: 14, 17, 41, 71, 47 and 74. Total number of two-digit numbers = 6 Number of two-digit even numbers = 2 Required probability =2/6=1/3
Question 5
1 / -0

Mean of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18, then the correct mean of the observations is

A
40

B
41

C
41

D
42

Solution

Incorrect mean of 9 observations = 35 Incorrect sum of 9 observations =35×9=315 Since, 81 is misread as 18. So, correct sum of observations =315−18+81=378 ∴ Correct mean =378/9=42