A gardener has bulbs that germinate with times that are normally distributed with a mean of 15 days and a standard deviation of 2.4 days.

What are the shortest 5% of germination times for these bulbs?

NOTE: I know you use the z-score formula to find the answer here but am confused as to how my professor found the zscore to equal -1.645 and then used it to solve for c. Please help!

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