the mean number of situps done by a group of stidents is 46 with a standard deviation of 7. if rylees z- score was 1.8, how many sit ups did she do

Darcy deposited $390 into a savings account. as long as the account balance remains at or above $150, she does not have to pay a service fee for the account. for how many months can she withdraw $40 a month without having to pay service fees? a) 3 b) 5 c) 6 d) 9