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Description
PROGRAM MCA
SEMESTER III
COURSE CODE & NAME DCA7101 – PROBABILITY AND STATISTICS
SET-I
- Bag I contain 3 red and 4 black balls and Bag II contain 4 red and 5 black balls. One ball is transferred from Bag I to Bag II and then a ball is drawn from Bag II. The ball so drawn is found to be red. Find the probability that the transferred ball is black.
Solution: Step -1: Consider all possible events for transferring balls.
Given that,
Bag I contains 3 red and 4 black balls.
Bag II contains 4 red and 5 black balls.
Let E1, E2, E3, E, be events such that,
E1: Both transferred balls from Bag I to Bag II are red.
E2:
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- A random variable has the following probability distribution
X | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
P(X=x) | 0 | a | 2a | 2a | 3a | a^2 | 2a^2 | 7a^2 + a |
Find
(i) the value of ‘a’
(ii) P [1.5<X<4.5/ X>2]
(iii) E(X)
(i)
Solution: Since it is a probability distribution, so, sum of all probabilities must be 1
- The daily earning of a vendor for a period of 43 days are given below
Daily earning (Rs.)
|
118-
126
|
127-
135
|
136-
144
|
145-
153
|
154-
162
|
163-
171
|
172-
180
|
No. of days | 3 | 8 | 9 | 12 | 5 | 4 | 2
|
Calculate Standard Deviation and coefficient of variation.
Solution:
Daily earnings | f | x | fx | (x-x̄) | F(x- x̄) | f(x- x̄)2 |
118-126 | 3 | 122 | 366 | -23.86 | -71.58 | 1707.90 |
127-135 | 8 | 131 | 1048 | -14.86 | -118.88 | 1766.56 |
136-144 | 9 | 140 | 1260 | -5.86 | -52.74 | 309.06 |
145-153 | 12 | 149 | 1788 | 3.14 | 37.68 | 118.32 |
154-162 | 5 | 158 | 790 | 12.14 | 60.7 | 736.90 |
163-171 | 4 | 167 | 668 | 21.14 | 84.56 | 1787.60 |
172-180 | 2 | 176 | 352 | 30.14 | 60.28 | 1816.84 |
Fx=43 | ∑fx=6272 | ∑f(x- x̄)2=8243.18 |
Mean x̄=
SET-II
- Suppose that a manufactured product has 2 defects per unit of product inspected. Using Poisson’s distribution, calculate the probabilities of finding a product without any defect, 3 defects, and 4 defects. (Given)
Solution:
Given:
A manufactured product has 2 defects per unit of product inspected
To find:
The probabilities of finding a product with
- out any defect
- Compute the regression equation of Y on X and regression equation of X on Y on the basis of the following information
X | Y | |
Mean | 40 | 45
|
Standard Deviation | 10 | 9 |
The correlation coefficient between X and Y is 0.50. Also estimate the value of Y for X = 48, using the appropriate regression equation.
Answer:
Given that,
The line of regression fo
- The following data relate to the prices and quantities of 4 commodities in the years 1982 and 1983. Construct the following index numbers of price for the year 1983 by using 1982 as base year.
(i) Laspeyre’s Index
(ii) Paasche’s Index
(iii) Fisher’s Index
Commodit Y
|
1982 | 1983
|
||||
Price | Quantity | Price | Quantity | |||
A | 5 | 100 | 6 | 150 | ||
B | 4 | 80 | 5 | 100 | ||
C | 2.5 | 60 | 5 | 72 | ||
D | 12 | 30 | 9 | 33 | ||
Solution:
Commodit Y
|
1982 | 1983
|
P1q0 | P0q0 | P1q1 | P0q1 | ||
Price(P0) | Quantity(Q0) | Price(P1) | Quantity(Q1) | |||||
A | 5 | 100 | 6 | 150 | 600 | 500 | 900 | 750 |
B | 4 | 80 | 5 | 100 | 400 | 320 | 500 | 400 |
C | 2.5 | 60 | 5 | 72 | 300 | 150 | 360 | 180 |
D | 12 | 30 | 9 | 33 | 270 | 360 | 297 | 396 |
Total | 1570 | 1330 | 2057 | 1726 |