For the distribution of interspike-time intervals described in Exercise 4.S.9, find the quartiles and the interquartile range.

Question:

For the of interspike-time intervals described in Exercise 4.S.9, find the quartiles and the interquartile range.
Exercise 4.S.9
In the nerve-cell activity of a certain individual fly, the time intervals between "spike" discharges follow approximately a normal with mean 15.6 ms and standard deviation 0.4 ms (as in Example 4.1.3). Let Y denote a randomly selected inter-spike interval
Distribution
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