Avatto > Bank Exam > Practice Questions > Quantitative Aptitude > Probability

Quantitative Aptitude MCQ - Probability

41 What would be the expectation of the number of failures preceding the first success in an infinite series of independent trials with the constant probability of success p ?

Expectation of X = E(X) = average = mean

Probability

where p_i denote probability of occurrence of x_i
Let q = 1-p
Then probabilities of succession 1st, 2nd, 3rd
trials are
p, qp, q²p,......

Probability

42 A restaurant serves two special dishes A and B to its customers consisting of 60% men and 40% women. 80% of men order dish A and the rest B and 70% women order dish A and the rest B. In what ratio of A to B should the restaurant prepare the dishes?

Ratio of A and B = 60 x 80 + 40 x 70 : 60 x 20
+40 x 30

= 76 : 24
= 19: 6

43 If A and B are mutually exclusive and
P (A ∪ B) = P (A) + P (B), then
P(A/A ∪ B) =

Probability

44 If P(A) = 0, then

Probability

45 The mean of a set of number is x'. If each number is increased by λ, then mean of the new set is

"When each item is increased by λ, then mean is also increased by λ"

Subtopics Covered

View All Subtopics

Quick Links

Difficulty Distribution

Easy 0%
Medium 0%
Hard 100%

Upcoming Papers

OCTOBER 11 SUNDAY

Sun, 11 OctExam todayIBPS Clerk 2026 Prelims Examination (Day 2)

Your Progress

0%

Start Practising!

You've answered 0 of 51 questions in this topic.

Practice Spotlight

Build momentum in Probability

Start with a short question set, review every explanation, and revisit difficult questions before moving ahead.

Day 8 / 10

Global Spotlight

Build Your First Streak

Complete one short Probability session today, then return tomorrow. Consistency matters more than a long first session.

Day 1 / 10

Question Spotlight

Question:

Three machines M1, M2 and M3 produce identicalitems. Of their respective output 5%, 4% and 3%of items are faulty. On a certain day, M1 hasproduced 25% of the…

A. 0.155
B. 0.255
C. 0.355
D. 0.455

Correct answer: C

Explanation:

Let the event of drawing a faulty item from any of the machines be A, and the event that an item drawn at random was produced by Mi…

Click to view the complete question details

Day 8 / 10 Open this question

Community Insight

Based on 5 saved attempts

Most Attempted TopicProbability
Most Challenging TopicProbability
Average Accuracy100%

Featured Question

(Based on recent community answers)

Q. #59430% Incorrect

A positive integer is selected at random and is divided by 7. What is the…

Try This Question →

This Week's Challenge

Complete 20 questions and set the community benchmark!

0 / 20 Start Challenge →

Why Practice with Avatto?

High Quality MCQsExam-focused questions with accurate answers

Detailed ExplanationsStep-by-step explanations to enhance learning

Latest Exam PatternBased on updated syllabus and pattern

Performance AnalyticsTrack performance and improve weak areas

100% Free PracticePractice unlimited questions for free

Forgot your password?

I agree with the Terms.