1
MHT CET 2024 11th May Morning Shift
MCQ (Single Correct Answer)
+2
-0

In an experiment with 15 observations for $x$, the following results were available $\sum x^2=2830, \sum x=170$. One observation 20 was found to be wrong and was replaced by the correct value 30 . Then the corrected variance is

A
78
B
210
C
225
D
88
2
MHT CET 2024 10th May Evening Shift
MCQ (Single Correct Answer)
+2
-0

The mean and variance of 7 observations are 8 and 16 respectively. If first five observations are $2,4,10,12,14$, then absolute difference of remaining two observations is

A
1
B
2
C
3
D
4
3
MHT CET 2024 10th May Morning Shift
MCQ (Single Correct Answer)
+2
-0

Mean and variance of six observations are 6 and 12 respectively. If each observation is multiplied by 3, then new variance of the resulting observations is

A
288
B
36
C
18
D
108
4
MHT CET 2024 9th May Evening Shift
MCQ (Single Correct Answer)
+2
-0

The variance of 20 observations is 5 . If each observation is multiplied by 3 and then 8 is added to each number, then variance of resulting observations is

A
$\frac{3}{4}$
B
$\frac{4}{3}$
C
$\frac{5}{3}$
D
$\frac{3}{5}$
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