## Help with Statistics Homework

PRACTICE WORKSHEET 3

1a. What are the possible ways that we can choose 2 from 4 different tennis players one by one?

b. What are the possible ways that we can choose 3 from 5 different classes?

2. Suppose that P (A) = 0.4 and P (AnB) = 0.16, find:

4. Suppose that P (A) =0.5 and P (B) =0.4. If events A and B are mutually exclusive,

5. If birth weights in a population are normally distributed with a mean of 120 Oz and a standard deviation of 15 Oz:

a. What is the chance of obtaining a birth weight of 135 Oz or heavier when sampling birth records at random?

b. What is the chance of obtaining a birth weight of 90oz or lighter?

6. Given a normally distributed population of diastolic blood pressures where the population average is 80mm/Hg and the standard deviation is 3mm/Hg, find:

a) The z score for a diastolic pressure of 86 mmHg.

b) The probability of a member of the population having a diastolic pressure of

c) The probability of member of the population having a diastolic pressure between 77mmHg and 86mmHg.

1a. What are the possible ways that we can choose 2 from 4 different tennis players one by one?

Solution : 4x3 = 12 ways we can choose 2 from 4 different tennis players one by one .

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