1
AP EAPCET 2024 - 22th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If a random variable $X$ has the following probability distribution, then its variance is nearly

$$ \begin{array}{clllllll} \hline X=x & -3 & -2 & -1 & 0 & 1 & 2 & 3 \\ \hline P(X=x) & 0.05 & 0.1 & 2 K & 0 & 0.3 & K & 0.1 \\ \hline \end{array} $$

A
2.8875
B
2.9875
C
2.7865
D
2.785
2
AP EAPCET 2024 - 22th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
A radar system can detect an enemy plane in one out of 10 consecutive scans. The probability that it cannot detect an enemy plane at least two times in four consecutive scans, is
A
0.9477
B
0.9523
C
0.9037
D
0.9063
3
AP EAPCET 2024 - 22th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

    Three numbers are chosen at random from 1 to 20 , then the probability that the sum of three numbers is divisible by 3 is

A
$\frac{1}{114}$
B
$\frac{147}{342}$
C
$\frac{16}{47}$
D
$\frac{32}{95}$
4
AP EAPCET 2024 - 22th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two persons $A$ and $B$ throw three unbiased dice one after the another. If $A$ gets the sum 13, then the probability that $B$ gets higher sum is
A
$\frac{5}{216}$
B
$\frac{4}{27}$
C
$\frac{35}{216}$
D
$\frac{20}{216}$
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