In the exercises 1-3 find the indicated probability and interpret the results

1. The mean annual salary for flight attendants is about $65,700. A random sample of 48 flight attendants is selected from this population. What is the probability that the mean annual salary of the sample is less than $63,400. Assume 0= $14,500.
2. During a certain week, the mean price of gasoline in the New England region was $3.796 per gallon. A random sample 32 of gas stations is selected from this population. What is the probability that the mean price for the sample was between $3.781 and $3.811 that week? Assume 0= $0.045.
3. During a certain week, the mean price of gasoline in California was $4.117 per gallon. A random sample of 38 gas stations is selected from this population. What is the probability that the mean price for the sample was between $4.128 and $ 4.143 that week? Assume o= $0.049.

please show all work for exercise questions thank you.