Statistics and Probability (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Math): Questions 1 - 3 of 8

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 155 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 150.00 or

Question number: 1

» Statistics and Probability » Probability of an Event

Appeared in Year: 2012

MCQ▾

Question

Let Sn=k=1n(k) denote the sum of the first n positive integers. The numbers S1, S2, S3, …, S99 are written on 99 cards. The probability of drawing a card with an even number written on it is –

Choices

Choice (4) Response

a.

49100

b.

12

c.

4999

d.

4899

Question number: 2

» Statistics and Probability » Probability of an Event

Appeared in Year: 2012

MCQ▾

Question

A purse contains 4 copper coins and 3 silver coins. A second purse contains 6 copper coins and 4 silver coins. A purse is chosen randomly and a coin is taken out of it. What is the probability that is a copper coin –

Choices

Choice (4) Response

a.

3170

b.

2770

c.

13

d.

4170

Question number: 3

» Statistics and Probability » Standard Deviation

Appeared in Year: 2014

MCQ▾

Question

Let n3 . A list of number x1,x2,,xn has mean μ and standard deviation σ . A new list of numbers y1,y2,,yn is made as follows: y1=x1+x22,y2=x1+x22 and yj=x for j=3, 4,n . The mean and the standard deviation of the list are μ^ and σ^ . Then which of the following is necessarily true?

Choices

Choice (4) Response

a.

μ=μ^andσσ^

b.

σ=σ^

c.

μμ^

d.

μ=μ^andσσ^

Sign In