For a particular brand of T.V. picture tube, it is known that the mean operating life of the tubes is 1050 hours with a standard deviation of 49 hours. What is the mean and the standard deviation of the mean operating life for a random sample of size 81?

Group of answer choices

1. mean=1050 and standard deviation=0.605
2. mean=12.963 and standard deviation=49
3. mean=1050 and standard deviation=5.444
4. mean=116.667 and standard deviation=0.605

how to calculate these?

1. A basketball player has a 0.7 of success rate in shooting free throws over the course of the season. If he shoots 30 free throws, what is the average number of free throws that he is successful?

2. The probability of obtaining a head for an unfair coin is 0.6. Suppose you toss this coin two times. What is the probability of getting a head and then a tail? Provide your answer to 3 decimal places.

3. A fair six-sided die is rolled. LetA be the event that a number greater than or equal to 2 is rolled. What is P(A)? Provide the answer to 3 decimal places (Do not provide answers in fractions)