Topic: exploring random variable and constructing probability distribution. Ps. Use "pmf" formula

E. Direction: Find the values of the indicated probabilities by defining a corresponding random variable and using pmf: 1. The probability of getting at most two heads when three coins are tossed simultaneously 2. The probability of getting at least one defective battery if four batteries are selected randomly from a batch of 10 batteries of which three known to be defective 3. The probability of getting a sum divisible by three if a pair of fair dice is rolled and the numbers that turn up are noted. 4. The probability that the spinner described in (3d) stops at a composite number at most once out of three spins 5. The probability that at least two female contestants will be among the three prize winners in an essay writing contest out of the six female and four male finalists