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Base Level Statistics

4. Use the appropriate table of areas to find the specified area under the standard normal curve to find the area that lies between 0 and 3.01

a. 0.9987

b. 0.4987

c. 0.1217

d. 0.5013

5. Find the probability of at least 2 girls in 6 births. Assume that male and female births are equally likely and that the births are independent events.

a. 0.891

b. 0.656

c. 0.234

d. 0.109

6. On a multiple choice test with 14 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the mean for the random variable X, the number of correct answers.

a. 10.5

b. 3.5

c. 4.7

d. 7

7. The probability that a radish seed will germinate is 0.7. A gardener plants seeds in batches of 11. Find the mean of the binomial random variable X, the number of seeds germinating in each batch.

a. 7.81

b. 9.9

c. 7.7

d. 3.3

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