The mean of 994 , 996 , 998 , 1000 and 1002 is
992
1004
998
None of these
In which subject is the student poor?
English
Mathematics
Science
History
The mean of 10 observations is 25. If one observation , namely 25 , is deleted , the new mean is
25
20
28
22
The arithmetic mean of first n natural number
n/2
n/2 + 1
The mean of x , x + 3 , x + 6 , x + 9 and x + 12 is
x + 6
x + 3
x + 9
x + 12
Which of the following is true?
Mode = 3 median + 2 mean
Mode = 3 median - 2 mean
Mode = 2 median + 3 mode
Mode = 2 median - 3 mean
If in a data , 10 numbers are arranged in increasing order. If the 7th entry is increased by 4 , then the median increases by
0
4
6
5
What are the average marks obtained by the students?
57
63
80
48
Which of the following is not a measure of central tendency?
Median
Standard deviation
Mean
Mode
Mean =
Sum of observations × Number of observations
Sum of observations + Number of observations
Sum of observations - Number of observations
