for question 8, I need parts a, b, d Thank you

8. The number X of days in the summer months that a construction crew cannot work because of the weather has the probability distribution: 6 7 8 9 10 11 12 13 14 P(z) 0.03 0.08 0.15 0.20 0.19 0.16 0.10 0.07 0.02 a. Find the probability that no more than ten days will be lost next summer. b. Find the probability that from 8 to 12 days will be lost next summer. c. Find the probability that no days at all will be lost next summer. d. Compute the mean and standard deviation of X. Interpret the mean in the context of the