MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The random variables X and Y have variances 0.2 and 0.5 respectively. Let Z= 5X-2Y. The variance of Z is? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 7 |
| Answer» E. | |
| 2. |
X is a variate between 0 and 3. The value of E(X2) is ______ |
| A. | 8 |
| B. | 7 |
| C. | 27 |
| D. | 9 |
| Answer» E. | |
| 3. |
If E denotes the expectation the variance of a random variable X is denoted as? |
| A. | (E(X))2 |
| B. | E(X2)-(E(X))2 |
| C. | E(X2) |
| D. | 2E(X) |
| Answer» C. E(X2) | |
| 4. |
A coin is tossed up 4 times. The probability that tails turn up in 3 cases is ______ |
| A. | \(\frac{1}{2} \) |
| B. | \(\frac{1}{3} \) |
| C. | \(\frac{1}{4} \) |
| D. | \(\frac{1}{6} \) |
| Answer» B. \(\frac{1}{3} \) | |
| 5. |
E (XY)=E (X)E (Y) if x and y are independent. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Mode is the value of x where f(x) is a maximum if X is continuous. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Find median and mode of the messages received on 9 consecutive days 15, 11, 9, 5, 18, 4, 15, 13, 17. |
| A. | 13, 6 |
| B. | 13, 18 |
| C. | 18, 15 |
| D. | 15, 16 |
| Answer» C. 18, 15 | |
| 8. |
Runs scored by batsman in 5 one day matches are 50, 70, 82, 93, and 20. The standard deviation is ______ |
| A. | 25.79 |
| B. | 25.49 |
| C. | 25.29 |
| D. | 25.69 |
| Answer» B. 25.49 | |
| 9. |
Let X be a random variable with probability distribution function f (x)=0.2 for |x| |
| A. | 0.3 |
| B. | 0.5 |
| C. | 0.4 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 10. |
Consider a dice with the property that that probability of a face with n dots showing up is proportional to n. The probability of face showing 4 dots is? |
| A. | \(\frac{1}{7} \) |
| B. | \(\frac{5}{42} \) |
| C. | \(\frac{1}{21} \) |
| D. | \(\frac{4}{21} \) |
| Answer» E. | |