1
MHT CET 2023 9th May Evening Shift
MCQ (Single Correct Answer)
+2
-0

A random variable $$\mathrm{X}$$ assumes values 1, 2, 3, ....., n with equal probabilities, if $$\operatorname{var}(X)=E(X)$$, then $$\mathrm{n}$$ is

A
4
B
5
C
7
D
9
2
MHT CET 2023 9th May Morning Shift
MCQ (Single Correct Answer)
+2
-0

The standard deviation of the following distribution

$$\mathrm{C.I.}$$ 0 - 6 6 - 12 12 - 18
$$\mathrm{f_i}$$ 2 4 6

is

A
5$$\sqrt2$$
B
$$\sqrt5$$
C
2$$\sqrt5$$
D
20
3
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+2
-0

The variance and mean of 15 observations are respectively 6 and 10 . If each observation is increased by 8 then the new variance and new mean of resulting observations are respectively

A
6, 18
B
6, 10
C
14, 10
D
14, 18
4
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+2
-0

Following data shows the information about marks obtained in Physics, Chemistry, Mathematics and Biology by 100 students in a class. Then subject shows the highest variability in marks

Physics Chemistry Mathematics Biology
Mean 20 25 23 27
S.D. 3 2 4 5

A
Mathematics
B
Chemistry
C
Biology
D
Physics
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