Page 53 - Math SL HB Sem 3

Statistics And Probability

Erample:

A coin is biased so that the probability of obtaining a head is ].lre coin is tossed four
3
times- Find the probability of obtaining exacrly two heads.

Example:

A four sided dice is thrown five times. IfX denotes the number ofthrees obtained, describe
:
thc distribution ofX and find P(X 2).

Erample:
The probability that a p€rson supports Party A is 0-6- Find the probabiliry rhat in a randomly
selected example of8 voters there are:

(a) Exactly 3 who support Parry A
(b) More than 5 who support Party A

Example:
A box contains a large number ofred and yellow tupil bulbs in the ratio l:J- Bulbs are
picked at random from the box- How many bulbs musr be picked so rhat the probability that
there is at least one rcd tulip bulb among them is greater than 0-95?

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