If the arithmetic mean of 6 , 8 , 5 , 7 , x and 4 is 7 , then x is
12
6
8
4
If mode = 80 and mean = 110 , then the median is
110
120
100
90
The mean of 994 , 996 , 998 , 1000 and 1002 is
992
1004
998
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 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
10
142
78
A data has 25 observations (arranged in descending order).Which observation represents the median?
12th
13th
14th
15th
At what subject is the student sharp?
English
Mathematics
Science
History
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
Mean =
Sum of observations × Number of observations
Sum of observations + Number of observations
Sum of observations - Number of observations
Which of the following is not a measure of central tendency?
Median
Standard deviation
Mean
Mode
