Chapter 8: Statistics And Probability - Online Test

Q1. Which of the following is not a measure of dispersion?
Answer : Option C
Explaination / Solution:
No Explaination.


Q2. The range of the data 8, 8, 8, 8, 8 . . . 8 is
Answer : Option A
Explaination / Solution:

Range = L - S = 8 - 8 = 0
Q3. The sum of all deviations of the data from its mean is
Answer : Option C
Explaination / Solution:


Q4. The mean of 100 observations is 40 and their standard deviation is 3. The sum of squares of all deviations is
Answer : Option B
Explaination / Solution:


Q5. Variance of first 20 natural numbers is
Answer : Option C
Explaination / Solution:


Q6. The standard deviation of a data is 3. If each value is multiplied by 5 then the new variance is
Answer : Option D
Explaination / Solution:


Q7. If the standard deviation of x, y, z is p then the standard deviation of 3x + 5 , 3y + 5 , 3z + 5 is
Answer : Option B
Explaination / Solution:


Q8. If the mean and coefficient of variation of a data are 4 and 87.5% then the standard deviation is
Answer : Option A
Explaination / Solution:


Q9. Which of the following is incorrect?
Answer : Option A
Explaination / Solution:
No Explaination.


Q10. The probability a red marble selected at random from a jar containing p red, q blue and r green marbles is
Answer : Option B
Explaination / Solution: