Statistics and Probability:

Directions Read and analyze the given problems below, Write your solutions and final answer on a separate alicet of paper. 1. ILAW Manufacturing company produces bulbs that last a mean of 900 hour with a standard deviation of 110 hours. What is the probability that the mean lifetime of a random sample of 15 of these bulba is less than 850 hour? 2. A school principal claims that grade 1 1 students have a mean grade of 86 with a standard deviation of 4. Suppose that the distribution is approximately normal. What is the probability that a randomly selected grade will be greater than 82 but less than 907