Statistics
A school has 20 teachers, one of them retires at the age of 60 years and a new teacher replaces him, this change reduces the average age of the staff by 2 years, the age of new teacher is
(1) 28 years
(2) 25 years
(3) 20 years
(4) 18 years
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 3 Solution : -. |
Statistics
If number 6, 8, 2x – 5, 2x – 1, 15, 17, 20 and 22 are in asending order and its mediun is 14 t hen the value of x will be
(1) 14
(2) 7
(3) 15
(4) 20
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 2 Solution : -. |
Statistics
If y=f(x) be a monotonically increasing or decreasing function of x and M is the median of variable x, then the median of y is
(1) f(M)
(2) M/2
(3) f−1(M)
(4) none of these
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 1 Solution : -. |
Statistics
The median of first 12 prime numbers is :
(1) 13
(2) 14
(3) 15
(4) 17
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 3 Solution : -. |
Statistics
The mean yearly salary of an employee of acompany was Rs. 20,000. If the mean yearly salaries of male and female employees were Rs. 20800 and Rs. 16800 respectively, then the percentages of males and females employed in the company respectively are
(1) 80% and 20%
(2) 70% and 30%
(3) 55% and 45%
(4) 50% and 50%
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 1 Solution : -. |
Statistics
When 10 is subtracted from all the observations, the mean is reduced to 60% of its value. If 5 is added to all the observations, then the mean will be
(1) 25
(2) 30
(3) 60
(4) 65
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 2 Solution : -. |
Statistics
The coefficient of range of a set of data is given to be 18. Then the ratio of the maximum value in the data to the minimum value is:
(1) 8 / 1
(2) 9 / 8
(3) 9 / 7
(4) 8 / 7
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 3 Solution : -. |
Statistics
The mean and median of the data x,y,z are 50 and 35respectively, where x<y<z. If z−x=55, then the value of (y−x) is
(1) 8
(2) 7
(3) 3
(4) 5
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 4 Solution : -. |
Statistics
Find the median of the following values :
37, 31, 42, 43, 46, 25, 39, 45, 32
1) 31
2) 46
3) 39
4) 43
A. | Option 1 |
B. | Option 2 |
C. | Option 3 |
D. | Option 4 |
Option: 3 Solution : -. |