Data Handling – Class 8.

Chapter 5 of NCERT/CBSE Class 8 Mathematics is about Data Handling. Here in this lesson you can find out practice problems for this chapter.

CBSE CLASS 8 MATHEMATICS
Data Handling – Chapter 5 / Model Questions.
Fill in the blanks:

  1. A die is thrown once. The probability of getting prime number is approximately ———-
  2. A die is thrown once. The probability of getting a number greater than 4 is ————
  3. Each outcome of an experiment or a collection of outcomes make an —————
  4. Groups 0-20, 20-40, 40-60 ……are called ————-
  5. The graphical representation of data in which bar of equal width with no gaps in between is called —————
    Answer the following:
  6. What is the probability of getting a ball which is not black from a basket containing 3 black, 5 yellow, 3 red and 4 blue balls.
  7. A bag has 2 red balls and 4 yellow balls. The balls are identical in all respects other than colour. A ball is drawn from the bag without looking into the bag. What is the probability of getting a red ball?
  8. When a coin is tossed, what is the probability of getting a tail?
  9. There are 20 boys and 15 girls are there in a class of 35 students. If chosen randomly what is the probability that the student is a
    a) boy
    b) Girl
  10. Find the probability of getting a prime number from a group of numbers 1 to 20?

ANSWERS:

  1. 0.5
  2. 1/3
  3. Event
  4. Class intervals.
  5. Histogram
  6. Total number of balls = 3 + 5 + 3 + 4 = 15
    Number of balls which are not black = 5 + 3 + 4 = 12
    Probability = 12/15 = 4/5.
  7. There are in all 2 + 4 = 6 outcomes of the event. Getting a red ball consists of 2 outcomes.
    Therefore, the probability of getting a red ball is 2/6 = 1/3.
    In the same way the probability of getting a yellow ball = 4/6 = 2/3.
  8. The possible outputs are H and T.
    The probability of getting tail is ½.
  9. Total number of students = 20 + 15 = 35
    a) Probability that a student is a boy = 20/35 = 4/7
    Probability that a student is a girl = 15/35 = 3/7
  10. There are 8 prime numbers between 1 and 20.
    Therefore, probability of getting a prime number = 8/20 = 2/5.

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