Three coins are tossed simulateneously 200 times with the following frequencies of different outcomes:

Outcome	3 heads	2 heads	1 head	No head
Frequency	23	72	77	28

Find the probability of getting at most two heads.

A bag contains 4 white balls and some red balls. If the probability of drawing a white ball from the bag is , find the number of red balls in the bag.

A die is thrown 100 times. If the probability of getting an even number is . How many times an odd number is obtained?

what is the probability of getting at least two heads?

The probability of an impossible event is