Kingdom of Saudi Arabia, Ministry of Higher Education
SALMAN BIN ABDULAZIZ UNIVERSITY
Statistics-3201; Home Work-2
1. Let the continuous random variable X denote the current
measured in a thin copper wire in mA. The PDF is F(x) = 0.05 for 0
≤ x ≤ 20.What is the probability that the current measurement is
between 5 & 10 mA?
2. If I toss a coin 20 times, what’s the probability of getting exactly
10 heads?
3. The number of visitors to a web server per minute follows a
Poisson distribution. If the average number of visitors per
minute is 4, what is the probability that:
(i) There are two or less visitors in one minute?
(ii) There are exactly two visitors in 30 seconds?
4. The average number of emergency calls that a hospital gets on
any day is 4. What is the probability that the hospital gets 6
calls on a particular day?
5. A fire chief collects data on the number of fires attended per
week, each week for a year.
No. of
0 1 2 3 4 5 6
fires
No. of
4 10 13 9 7 4 2
weeks
Compute the theoretical frequency
Date of submission:16 April-2014
Name:……………………………………………………….. Stud.ID……………………
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