Questions

4 Marks Each

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3 questions · timed · auto-graded

Question 14 Marks
Win, loss or draw are the possible results for a team in a
football match. A person predicts the results of $5$ matches.
Find the probability that his $(1)\ 3$ predictions turn
to be true $(2)$ at the most two predictions turn to be true.
Answer
$(1)\ \frac{40}{243}$
$(2)\ \frac{64}{81}$
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Question 34 Marks
There are $7$ red and $3$ blue pens in a box. If $4$ pens are
randomly selected from it, find the probability
distribution of the number of red pens in it. Obtain its mean
and variance from it.
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4 Marks Each - Statistics STD 12 Commerce Questions - Vidyadip