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8th Grade > Mathematics

DATA HANDLING MCQs

Total Questions : 57 | Page 1 of 6 pages
Question 1. There is a bag which contains 50 balls of same size. 20 of those balls are red in colour and remaining 30 are white. Now, if you take a ball out from the bag what can be said about its colour?
  1.    It must be red
  2.    It must be white
  3.    May be red or white
  4.    Getting a red ball and getting white ball are two equally likely outcomes
 Discuss Question
Answer: Option C. -> May be red or white
:
C
The withdrawn ball may be of red colour or white colour. Since white balls are 30 in number, it is more likely that withdrawn ball will be white incolour. Similarly, it is less likely that ball will be red. We can never be sure that withdrawn ball is of red or white unless all the balls are of same colour.
Question 2. One cannot predetermine the outcome of a random experiment.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
:
A
By definition,the outcome of a random experiment cannot be predetermined by definition.
Question 3. A coin is thrown and it lands on a chess board. Find the probability of it landing on a white square if it falls exactly inside a square.
  1.    164
  2.    132
  3.    14
  4.    12
 Discuss Question
Answer: Option D. -> 12
:
D
Probability=Number of favourable outcomesTotal Number of outcomes
Number of white squares (favourable outcomes) = 32
Total number of squares or outcomes = 64
So probability of coin falling in a white square
=Number of white squaresTotal number of squares
=3264
=12
Question 4. In a bar graph, the heights of the bars are proportional to the respective frequencies of the different categories.
  1.    True
  2.    False
  3.    Data
  4.    Tally marks
 Discuss Question
Answer: Option A. -> True
:
A
A bar graph displays information using bars of uniform width and their heights being proportional to the respective frequencies. Thus, the above statement is true.
Question 5. The following data relates to the expenses for a household in Bangalore.
ItemsExpenditure(in Rs)Food4000Clothing2000Rent1500Education1500Miscellaneous1000
The central angle of Clothing will be ___.
  1.    36∘
  2.    54∘
  3.    59∘
  4.    72∘
 Discuss Question
Answer: Option D. -> 72∘
:
D
Total expenditure is:
4000 + 2000 + 1500 + 1500 + 1000 = 10,000
Central angle of clothing is
=expenditure on clothingtotal expenditure
=(200010000×360)=72
Question 6. The kind of graph the following figure represents is a __ graph
The Kind Of Graph The Following Figure Represents Is A __ Gr...
 Discuss Question

:
Bar graph is a graph of rectangles where the height of the bar gives us the quantity we are interested in.Thus, the figure aboverepresents a bar graph.
Question 7. Statement 1: Bar Graph is a graph of rectangles.
Statement 2: Width of the rectangle gives us the quantity that bar is representing.
  1.    1 and 2 both are true
  2.    1 is true and 2 is false
  3.    2 is true and 1 is false
  4.    Both 1 and 2 is false
 Discuss Question
Answer: Option B. -> 1 is true and 2 is false
:
B
Statement 1: Bar Graph Is A Graph Of Rectangles.Statement 2:...
A bar graph is shown in the figure above. As you can see the height of the rectangle gives us the frequency of the objectthe bar is representing. The width does not represent any quantity. Thus statement 1 is true while statement 2 is false.
Question 8. What is the lower class limit for the class interval 40 - 70?
  1.    55
  2.    45
  3.    40
  4.    35
 Discuss Question
Answer: Option C. -> 40
:
C
We know that the lower class limit for a class is the lowest value that can go into that class.
So, the lower class limit for the class 40-70 is 40.
Question 9. There is a box containing 10 ping pong balls of 3 different colours red, green and blue. There are 2 red balls and 3 green balls. What is the probability of getting a blue ball in the first attempt?
  1.    12
  2.    23
  3.    34
  4.    56
 Discuss Question
Answer: Option A. -> 12
:
A
Total number of Blue Balls= 10-(2+3) =5
Probability of getting Blue Balls
=Number of blue ballsTotal number of balls
=510
=12
Question 10. The graph below shows average height of girls at different age. What will be the age of the girl whose height is 65 inches? Refer to the bar graph below to answer this question.
The Graph Below Shows Average Height Of Girls At Different A...
  1.    10
  2.    20
  3.    15
  4.    None of these
 Discuss Question
Answer: Option C. -> 15
:
C
According to the bar graph, we get to know that a girlwhose age is 10 years has a height of 60 inches, if the age is 15 years then the height is 65 inches and lastly if the age is 20 years then the height is 66 inches. Hencethe height of the 15 year old girl is 65 inches.

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