Statistics - Online Test

Q1. If the coefficient of variation between x and y is 0.28, covariance between x and y is 7.6, and the variance of x is 9, then the S.D. of the y series is
Answer : Option C
Explaination / Solution:



Q2. The Q.D. of the daily wages (in Rs) of 7 persons given below: 12,7,15,10,17,19,25 is
Answer : Option A
Explaination / Solution:

the given data in ascending order is





Q3. Which of the following is not a measure of central tendency :
Answer : Option C
Explaination / Solution:

meausre of central tendencies give the middle most or average value whereas range gives the difference between highest and lowest value.

Q4. If the mean of numbers 27,31,89,107,156 is 82 , then the mean of 130,126,68,50,1 is :
Answer : Option B
Explaination / Solution:

mean=130+126+68+50+15=3755=75
Q5. If in moderately asymmetrical distribution mode and mean of the data are 6 μ and 9 μ respectively, then median is
Answer : Option A
Explaination / Solution:

median=mode+2mean3=6μ+2(9μ)3=24μ3=8μ
Q6. If the mean of the squares of first n natural numbers be 11, then n is equal to
Answer : Option C
Explaination / Solution:



Q7. If the mean of the first n odd natural numbers be n itself, then n is equal to
Answer : Option C
Explaination / Solution:


here, n can be any natural number


Q8. The mean of the first n terms of the A.P. (a + d ) + ( a + 3d ) + ( a + 5d ) +………..is
Answer : Option B
Explaination / Solution:



Q9. If a, b, c be any three positive numbers, then the least value of 
Answer : Option A
Explaination / Solution:

A.MH.Ma+b+c331a+1b+1c(a+b+c)(1a+1b+1c)3×39
Q10. The median of the data 13,14,16,18,20,22 is
Answer : Option C
Explaination / Solution: