11. Is there a formula for this sort of question?

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#11. Is there a formula for this sort of question?
0W Juu buy TIcke iur $l dut of a lottery of 1,000 tickets wherethe prize for the one winning
ticket is to be $500. What is your expected value?
9)
$0.50
B) - $0.40
C) - $1.00
D) $0.00
Answer the question.
10) Suppose that voting in municipal elections is being studied and that the accompanying tables descri
probability distribution for four randomly selected people, wherex isthe number that voted in thel
election. Is it unusual to find four voters among four randomly selected people?
10)
x|P(x)
0| 0.23
10.32
2|0.26
30.15
4 0.04
A) No
B) Yes
Find the indicated probability.
11) A test consists of 10 true/false questions. To passthe test a student must answ er at least 8 questions
correctly. If a student guesses on each question, what is the probability that the student will pass
11)
the test?
A) 0.044
B) 0.055
C) 0.011
D) 0.989
810,S
Solve the problem.
12) The annual precipitation amounts in a certain mountain range are normally distributed with a
mean of 75 inches, and a standard deviation of 16 inches. What is the probability that the mean
annual precipitation during 64 randomly picked years will beless than 77.8 inches?
A) 0.5808
12)
B) 0.4192
C) 0.0808
D) 0.9192
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
13)
13) A certain question on a test is answered correctly by 22% of the respondents. Estimate the
probability that among the next 150 responses there will be at most 40 correct answ ers.
A) 0.8997
C) 0.0694
D) 0.1003
B) 0.9306
Use the normal distribi
the desired probability.
Transcribed Image Text:0W Juu buy TIcke iur $l dut of a lottery of 1,000 tickets wherethe prize for the one winning ticket is to be $500. What is your expected value? 9) $0.50 B) - $0.40 C) - $1.00 D) $0.00 Answer the question. 10) Suppose that voting in municipal elections is being studied and that the accompanying tables descri probability distribution for four randomly selected people, wherex isthe number that voted in thel election. Is it unusual to find four voters among four randomly selected people? 10) x|P(x) 0| 0.23 10.32 2|0.26 30.15 4 0.04 A) No B) Yes Find the indicated probability. 11) A test consists of 10 true/false questions. To passthe test a student must answ er at least 8 questions correctly. If a student guesses on each question, what is the probability that the student will pass 11) the test? A) 0.044 B) 0.055 C) 0.011 D) 0.989 810,S Solve the problem. 12) The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 75 inches, and a standard deviation of 16 inches. What is the probability that the mean annual precipitation during 64 randomly picked years will beless than 77.8 inches? A) 0.5808 12) B) 0.4192 C) 0.0808 D) 0.9192 Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution. 13) 13) A certain question on a test is answered correctly by 22% of the respondents. Estimate the probability that among the next 150 responses there will be at most 40 correct answ ers. A) 0.8997 C) 0.0694 D) 0.1003 B) 0.9306 Use the normal distribi the desired probability.
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