Question

A fair coin is tossed 20 times. The probability of getting the three or more heads is 0.7870

Answer 1

Answer:

78.9 as it hasbeen tossed 20 times so20 divide by 0.7870

Answer 2

Answer:

The probability is 0.6.

Step-by-step explanation:

CONCEPT: Probabilty

GIVEN:

Tosses of the coin = 20

Probability of getting the three or more heads = 0.7870

Probability of getting three or more heads or tails in a row = 0.9791.

TO FIND:

Probability of getting three or more heads in a row  and three or more tails in a row

SOLUTION;

Let the event of getting three or more heads in a row in 20 tosses = X

Let the event of getting three or more tails in a row in 20  tosses = Y

Thus,

P( X ) = P( Y ) = 0.7870 and

P( X ∪ Y) = 0.9791.

Using the probability relation: P(X ∪ Y) = P(X) + P(Y) − P(XY),

Step-by-step explanation:

Thus, the probability will be -  

P(XY) = 0.7870 + 0.7870 − 0.9791

= 1.574 - 0.9791

= 0.6

Answer: The probability is 0.6.