Answer:
i believe it's 12 but i'm not entirely sure
Step-by-step explanation:
i hope this helps :) please let me know if it was wrong
have a nice day !!
a. Your answer is correct.
b. Divide the given value of sigma by √n where n = sample size = 7. Then perform the same calculation you did for part a. The probabiilty is 0.4427.