A data has 25 observations (arranged in descending order).Which observation represents the median?
12^{th}
13^{th}
14^{th}
15^{th}
If mode = 80 and mean = 110 , then the median is
110
120
100
90
The arithmetic mean of first ten natural numbers is
5.5
6
7.5
10
What are the average marks obtained by the students?
57
63
80
48
The mean and median of a data are 14 and 15 respectively. The value of mode is
16
17
13
18
The daily sale of Kerosene (in litres ) in a ration shop for six days is as follows :
75 , 120 , 12 , 50 , 70.5 and 140.5. The average daily sale is
150
142
78
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
The arithmetic mean of first n natural number
^{n}/2
^{n}/2 + 1