The arithmetic mean of first ten natural numbers is
5.5
6
7.5
10
The arithmetic mean of first n natural number
n/2
n/2 + 1
Mean =
Sum of observations × Number of observations
Sum of observations + Number of observations
Sum of observations - Number of observations
At what subject is the student sharp?
English
Mathematics
Science
History
In which subject is the student poor?
The mode of a set of observations is the value which
occurs most frequently
is central
is between maximum and minimum
none of these
The mean of x , x + 3 , x + 6 , x + 9 and x + 12 is
x + 6
x + 3
x + 9
x + 12
The mean of 10 observations is 25. If one observation , namely 25 , is deleted , the new mean is
25
20
28
22
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
5
If mode = 80 and mean = 110 , then the median is
110
120
100
90
