The mean length of rope in 40 coils is 14m. A new coil is added in which the length of the rope is 18m. What is the mean length of the ropes now?
14.5 m
14.1 m
14.3 m
14 m
The number of wickets taken by a bowler in eight innings is given below. Find the mode.1, 4, 3, 5, 3, 4, 3, 6
5
3
4
6
Find the lower quartile of the first twelve natural numbers.
3.5
4.5
2.5
5.5
Four variates are 2, 4, 6,and 8. The frequencies of the first three variates are 3,2 and 1 respectively. If the mean of the variates is 4 then find the frequency of the fourth variate.
2
1
The mean age of 10 boys is calculated to be 16 years. Later it was detected that one boy's age was taken 12 years more than the actual; and another boy's age was taken 7 years less than the actual. Find the correct mean of the ages of the boys.
15 years
15.1 years
15.6 years
15.5 years
The marks obtained by 19 students of a class are given below: 27, 36, 22, 31, 25, 26, 33, 24, 37 32, 29, 28, 36, 35, 27, 26, 32, 35, 38. Find Lower Quartile.
26
33
27
35
A student got the following marks in 9 questions of a question paper: 3, 5, 7 , 3 , 8, 0 ,1 , 4 and 6.Find the median of these marks.
7
Marks obtained (in Mathematics) by the students are given : 60, 67, 52, 76, 50, 51, 74, 45, 56. Find the arithmetic mean if marks of each student is increased by 4.
59
63
64
50
If the mean of 6, 4, 7, a and 10 is 8. Find the value of 'a'.
10
13
12
9
A boy scored following marks in various class tests during a term; each test being marked out of 20. 15, 17, 16, 7, 10, 12, 14, 16, 19, 12, 16.What are his modal marks.
17
15
16
