Assignment- 3
A. X is a discrete random variable. The table below defines a probability distribution for X.
1) What is P (X < 2)? 2) What is P (X > 2)? 3) What is P (2 < X < 5)?
x | P(X=x) |
1 | 0.09 |
2 | 0.03 |
3 | 0.52 |
4 | 0.24 |
5 | 0.12 |
B. Steph makes 90% of the free-throws she attempts. She is going to shoot 3 free-throws. Assume that the results of free-throws are independent from each other. Find the probability that she makes exactly 2 of the 3 free-throws.
C. A large group of students took a test in Physics and the final grades have a mean of 70 and a standard deviation of 10. If we can approximate the distribution of these grades by a normal distribution, what percent of the students should get grades greater than 60?
D. A set of laptop prices are normally distributed with a mean of 750 dollars and a standard deviation of 60 dollars. What proportion of laptop prices are between 624 dollars and 768 dollars?
Answer:
A:
B;
C & D:
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