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Probability MATHS - Probability

ICSE - STD 8 - MATHS (ICSE - English Medium). 24 questions in this chapter.

Question types

Probability question types

24 questions across 4 question groups — pick any mix to generate a MATHS paper with step-by-step answer keys.

24
Questions
4
Question groups
5
Question types
Sample Questions

Probability questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2[1 Mark Question Answer]1 Mark
In a box of 100 electric bulbs, 8 bulbs are defective. If one bulb is taken out a random from the box, what is the probability that the bulb drawn is (i) defective? (ii) non-defective?
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Q 6[2 Mark Question Answer]2 Marks
19 cards, numbered 1, 2, 3, ....., 19 are put in a box and mixed thoroughly. One card is chosen at random from the box. What is the probability that the number on the chosen card is :
(i) a prime number ?
(ii) a multiple of 4?
(iii) a composite number less than 10 ?
(iv) neither divisible by 3 nor 5 ?
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Q 9[4 marks sum]4 Marks
A bag contains 6 red, 8 green, 9 blue and 4 yellow balls. One ball is drawn at random.
Q.1. The probability that the ball drawn is blue, is :
(a) $\frac{1}{3}$ $\quad$ (b) $\frac{2}{3}$ $\quad$ (c) $\frac{2}{9}$ $\quad$ (d) $\frac{4}{9}$
Q.2. The probability that the ball drawn is either red or blue, is:
(a) $\frac{1}{2}$ $\quad$ (b) $\frac{4}{9}$ $\quad$ (c) $\frac{5}{9}$ $\quad$ (d) $\frac{14}{27}$
Q.3. The probability that the ball drawn is non-green, is :
(a) $\frac{7}{9}$ $\quad$ (b) $\frac{13}{27}$ $\quad$ (c) $\frac{19}{27}$ $\quad$ (d) $\frac{23}{27}$
Q.4. The probability that the ball drawn is non-red, is :
(a) $\frac{7}{9}$ $\quad$ (b) $\frac{13}{27}$ $\quad$ (c) $\frac{19}{27}$ $\quad$ (d) $\frac{23}{27}$
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Q 10MCQ1 Mark
One card is drawn from a well-shuffled deck of 52 cards. What is the probability that the card drawn is a 5?
  • ✓
    $\frac{1}{13}$
  • B
    $\frac{1}{26}$
  • C
    $\frac{1}{52}$
  • D
    $\frac{2}{13}$

Answer: A.

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Q 11MCQ1 Mark
Ten cards, numbered from 1 to 10, are kept in a box and mixed thoroughly. One card is chosen at random. What is the probability of getting a number less than 7?
  • A
    $\frac{3}{10}$
  • B
    $\frac{7}{10}$
  • ✓
    $\frac{3}{5}$
  • D
    $\frac{5}{7}$

Answer: C.

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Q 12MCQ1 Mark
The probability that a letter chosen at random from the letters of the word PORCUPINE is a vowel is:
  • A
    $\frac{1}{3}$
  • ✓
    $\frac{4}{9}$
  • C
    $\frac{5}{9}$
  • D
    $\frac{2}{3}$

Answer: B.

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Q 13MCQ1 Mark
A bag contains 4 black and 6 white balls. One ball is drawn at random. What is the probability that the ball drawn is black ?
  • A
    $\frac{2}{3}$
  • B
    $\frac{1}{2}$
  • ✓
    $\frac{2}{5}$
  • D
    $\frac{1}{6}$

Answer: C.

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Q 14MCQ1 Mark
Two coins are tossed simultaneously. What is the probability of getting one head and one tail?
  • A
    $\frac{1}{4}$
  • ✓
    $\frac{1}{2}$
  • C
    $\frac{2}{3}$
  • D
    $\frac{3}{4}$

Answer: B.

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