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For drawing frequency polygon of a continous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abcissa are class intervals.
The above statement is:A.
FalseB.
TrueC.
True for discontinous.D.
None of the above
The mean of 50 items was found to be 50. Later on it was discovered that two items were misread as 50 and 10 instead of 20 and 90 respectively. The correct mean is ?A.
51 kgB.
49 kgC.
50 kgD.
52 kg
The mean weight of six boys in a group is 40 kg. The individual weights of five them are 25 kg, 40 kg, 35 kg , 35 kg and 45 kg. The weight of 6th boy is ?A.
60 kgB.
50 kgC.
10 kgD.
20 kg
Classify the numbers as rational or irrational : 7.478478A.
rational B.
irrational C.
can't sayD.
rational /irrational
Which of the following is not a measure of central tendency?A.
ModeB.
MeanC.
MedianD.
Range
What is the mean of first 15 whole numbers?A.
5.5B.
5C.
4.6D.
7
The mean of 15 observations is 50. Out of these observations, if the mean of first 8 observations is 40 and the mean of last 8 observations is 55. The 8th observation is:A.
10B.
15C.
12D.
20
If the mean of the observation: x+1, x+3, x+5, x+7, x+9 is 8, the mean of the last three observations would be _______ .A.
20B.
17C.
10D.
24