Given Some patients suffer from extreme migraines on a fairly regular basis. A network of doctors asked migraine sufferers to record how often they are inflicted with a severe migraine during a 3-month period. The following consists of the relative frequency of severe migraines for this population during that time.

y = number of migraines 0 - 2 3 4 5 6 P( Y = y) 151 .232 .354 .161 .067 .021