For data sets having a distribution that is approximately bell-shaped and with variance 9, the proportion of the scores within 6 of the mean
Select one:
Is approx 68%
B- none of answers
C-determined by pop mean and standard dev
D-is approx 99.7
E- is approx 95%
I think this is a trick question but not sure !

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?