Two coins are tossed 1000 times and the outcomes are recorded as below :
Number of heads 2 1 0
Frequency 220 550 250
Based on this information, the probability for at most one head is
a. 1/5
b. 1/4
c. 4/5
d. 3/4

Solution:

It is given that

Total number of coins tossed n(S) = 1000

We know that

Number of outcomes in which atmost one head n(E) = 550 + 250 = 800

So the probability for at most one head = n(E)/n(S)

Substituting the values

= 800/1000

= 4/5

Therefore, the probability for at most one head is ⅘.

✦ Try This: In a survey of 354 children aged 12-60 months, it was found that 263 liked to eat potato chips. If a child is selected at random, the probability that he/she does not like to eat potato chips is :

☛ Also Check: NCERT Solutions for Class 9 Maths Chapter 14

NCERT Exemplar Class 9 Maths Exercise 14.1 Problem 28

Two coins are tossed 1000 times and the outcomes are recorded as below : Number of heads 2 1 0 Frequency 220 550 250. Based on this information, the probability for at most one head is a. 1/5, b. 1/4, c. 4/5, d. 3/4

Summary:

Two coins are tossed 1000 times and the outcomes are recorded. Based on this information, the probability for at most one head is 4/5

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