A four - digit number is formed by the digits 1, 2, 3, 4 with no repetition. The probability that the number is odd, is

1) Zero 2) 1/3 3) 1/4 4) None of these  

Question 7 Suppose that 5 independent trials, each of which results in any of the outcomes 0, 1, or 2, with respective probabilities 0.3, 0.5, and 0.2, are performed. Find the probability that both outcome 1 and outcome 2 occur at least once. (Hint: Consider the complementary probability.)

Question 7 A consulting engineer receives, on average, 0.7 requests per week. If the number of requests follows a Poisson process, find the probability that
a) in a given week, there will be at least one request;
b) in a given 4-week period, there will be at least 3 requests.

Find the probability that a leap year has 52 Sundays.