in the case of a coin toss for three times, we have cases like getting 0 head, 1 head, 2 head and 3 head we calculate PMF accordingly ... but what should be the case for this question ... whether should we calculate the probability of student that stay in each year or students that leave college each year?
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The number of students admitted to college A as freshmen is 1000 and on average 15% of the students drop every year of college (assume all degrees take 4
years).
(a) Plot the Probability Mass Function (PMF) and Cumulative Distribution Function (CDF) of the random variable corresponding to year in college of a student (Hint: X = (1, 2, 3 ,4).
i solved : 15% of 1000 = 150 leaves in first year so p(1) = (150 / 1000)
similarly now 15 % of 850 = 127.5 so p(2) = 127.5/850
is this the correct way ?
...
The number of students admitted to college A as freshmen is 1000 and on average 15% of the students drop every year of college (assume all degrees take 4
years).
(a) Plot the Probability Mass Function (PMF) and Cumulative Distribution Function (CDF) of the random variable corresponding to year in college of a student (Hint: X = (1, 2, 3 ,4).
i solved : 15% of 1000 = 150 leaves in first year so p(1) = (150 / 1000)
similarly now 15 % of 850 = 127.5 so p(2) = 127.5/850
is this the correct way ?