hello pls answer both and provide solution. thank you!

1. Central Limit Theorem The average life span of a Motolite battery is 5 years with a standard deviation of 2.9 years. A sample drawn of 45 batteries were tested and found out that the mean life span of the battery is 4 years. Find the probability that the Motolite battery has less than 4 years life span. 2. t - distribution Find the range of t-score where we can expect to find the middle 99% of sample means in the sample data of (5, 3, 8, 9, 10, 7, 7, 8) which are drawn from a normal population