79
MCQ (Single Correct Answer)
A box contains 3 orange balls, 3 green balls and 2 blue balls. Three balls are drawn at random from the box without replacement. The probability of drawing 2 green balls and one blue ball is
A
$\frac{3}{28}$
B
$\frac{2}{21}$
C
$\frac{1}{28}$
D
$\frac{167}{168}$
80
MCQ (Single Correct Answer)
A flashlight has 8 batteries out of which 3 are dead. If two batteries are selected without replacement and tested, then probability that both are dead is
A
$\frac{33}{56}$
B
$\frac{9}{64}$
C
$\frac{1}{14}$
D
$\frac{3}{28}$
81
MCQ (Single Correct Answer)
If eight coins are tossed together, then the probability of getting exactly 3 heads is
A
$\frac{1}{256}$
B
$\frac{7}{32}$
C
$\frac{5}{32}$
D
$\frac{3}{32}$
82
MCQ (Single Correct Answer)
Two dice are thrown. If it is known that the sum of numbers on the dice was less than 6 , the probability of getting a sum 3 , is
A
$\frac{1}{18}$
B
$\frac{5}{18}$
C
$\frac{1}{5}$
D
$\frac{2}{5}$
83
MCQ (Single Correct Answer)
Which one is not a requirement of a Binomial distribution?
A
There are 2 outcomes for each trial
B
There is a fixed number of trials
C
The outcomes must be dependent on each other
D
The probability of success must be the same for all the trials