Question

Q.18 Read the text given below and answer any 4 questions that follow.
Three coins are tossed simultaneously 200 times with the following frequencies
of different outcomes given in the table. Read the data given in the table
carefully
Outcome
Frequency 20
3 tails 2 tails 1 tail No tails
68 82 30
(1) getting less than 3 tails is
(2) exactly 2 heads
(3) exactly 1 head is
(4) at least 1 tails is
(5) all head is ??

please answer tomorrow is my exam!!​

Answer 1

What is the probability of getting at least 2 tails? Since T - H - H - H can be arranged in 4!/3! = 4 ways, then P(getting exactly 1 tail) = 4 x 1/16 = 4/16. P(at least 2 tails) = 1 - (4/16 + 1/16) = 11/16.