12th Standard Syllabus & Materials
12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set C
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set B
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set A
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set C
Published on: 09/11/2020
12th Standard Business Maths Random Variable and Mathematical expectation English Medium Free Online Test One Mark Questions with Answer Key 2020 - 20
Download Tamil Nadu 12th Standard Business Maths and Statistics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Business Maths and Statistics Test
1.
X is a random variable. Taking the values 3, 4 and 12 with probabilities \(\frac{1}{3},\frac{1}{4}\)and \(\frac{5}{12}\).Then E(X) is
5
7
6
3
2.
X is a discrete random variable. Which take values 0,1,2 and P(X = 0) = \(\frac{144}{169}\), P(X = 1) = \(\frac{1}{169}\), then the value of P(X = 2) is ________
\(\frac{145}{169}\)
\(\frac{24}{169}\)
\(\frac{2}{169}\)
\(\frac{143}{169}\)
3.
A random variable X has the following probability distribution
| X | 0 | 1 | 2 | 3 | 4 | 5 |
| P(X=x) | \(\frac{1}{4}\) | 2a | 3a | 4a | 5a | \(\frac{1}{4}\) |
Then P(1≤X≤4) is
\(\frac{10}{21}\)
\(\frac{2}{7}\)
\(\frac{1}{14}\)
\(\frac{1}{2}\)
4.
The distribution function F(x) is equal to ________.
\(P(X=x)\)
P(X\(\le\)x)
P(X\(\ge\)x)
all of these
5.
If c is a constant in a continuous probability distribution, then p(x = c) is always equal to ________.
zero
one
negative
does not exist
6.
A discrete probability distribution may be represented by ________.
table
graph
mathematical equation
all of these
7.
Which of the following is not possible in probability distribution?
\(\sum { p(x)\ge 0 } \)
\(\sum { p(x)=1 } \)
\(\sum { xp(x)=2 } \)
\(p(x)=-0.5\)
8.
A formula or equation used to represent the probability distribution of a continuous random variable is called ________.
probability distribution
distribution function
probability density function
mathematical expectation
9.
Given E(X)=5 and E(Y)=−2, then E(X−Y) is ________.
3
5
7
-2
10.
Demand of products per day for three days are 21, 19, 22 units and their respective probabilities are 0.29, 0.40, 0.35. Profit per unit is 0.50 paisa then expected profits for three days are ________.
21, 19, 22
21.5, 19.5, 22.5
0.29, 0.40, 0.35
3.045, 3.8, 3.85
1.
(b)
7
2.
(b)
\(\frac{24}{169}\)
3.
(d)
\(\frac{1}{2}\)
4.
(b)
P(X\(\le\)x)
5.
(a)
zero
6.
(d)
all of these
7.
(d)
\(p(x)=-0.5\)
8.
(c)
probability density function
9.
(c)
7
10.
(d)
3.045, 3.8, 3.85
12th Standard Syllabus & Materials
12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set B
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set A
NEW12th Standard
TN 12th Standard Physics Wave Optics Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Physics Wave Optics Creative Questions Study Material - QB365 Set C
Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
English
French
Tamilnadu Stateboard Standards
