Q. 23.9( 13 Votes )

# Two coins are tossed 400 times and we get

Two heads:112 times; one head 160 times ;0 times; 0 head :128 times.

When two coins are tossed at random, what is the probability of getting

(i) 2 heads? (ii) 1 heads? (iii) 0 head?

Answer :

Total number times coin tossed: 400

Number of times Two heads occurred: 112

Number of times One head occurred: 160

Number of times No head (zero head) occurred: 128

Probability P()=

(i). Let p(H_{1}) be probability of getting Two heads

P (H_{1}) =

P (H_{1}) = = 0.28

(ii). Let p(H_{2}) be probability of getting One head

P (H_{2}) =

P (H_{2}) = = 0.4

(iii). Let p(H_{3}) be probability of getting No head

P (H_{3}) =

P (H_{3}) = = 0.32

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PREVIOUSA coin is tossed 500 times and we gethead : 285 times, tail :215 times.When a coin is tossed at random, what is the probability of getting(i) a head? (ii) a tail?NEXTThree coins are tossed 200 times and we getthree heads:39 times; two heads: 58 times;one head :67 times: 0 head: 36 times.When there coins are tossed at random, what is the probability of getting(i) 3 heads? (ii) 1 head? (iii) 0 head (iv) 2 heads?

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