Question

21. Three coins are tossed simultaneously 250 times and following frequencies of
the outcomes are recorded.
Outcomes
3 heads
2 heads
1 head
No head
Frequency
25
70
63
Find the probability of getting no head.
​

Answer 1

Frequency (no heads) = 250 - (23 + 72 + 77) = 78

(1) P(getting no heads) = 78/250= 39/125

(2) P(getting atleast one head) = (23 + 72 + 77)/250 = 172/250 = 86/125