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A class consists of 6 women and 25 men. If a student is randomly selected from the class, find the probability that the student is a woman. Write your answer as a decimal rounded to 3 places. OA. 0.345 OB. 0.240 O C. 0.194 O D. 0.523
Assume that when adults with smartphones are randomly selected, 37% use them in meetings or classes. If 7 adult smartphone users are randomly selected, find the probability that exactly 5 of them use their smartphones in meetings or classes. The probability is. (Round to four decimal places as needed.)
Roberta wants to buy tickets for a raffle. The organizers say the chance of a ticket being a winner is 35%. She decides to buy 10 raffle tickets. Find the probability that all 10 of her raffle tickets turn out to be winners. (round your answer CAREFULLY to 6 decimal places). The probability of her getting 10 winning tickets is Interpret this answer. Which of the following is true? A. She should be surprised that her raffle tickets are all winners because the probability of that happening is very high. O B. She should be surprised that her raffle tickets are all winners because the probability of that happening is very low. OC. She should not be surprised that her raffle tickets are all winners because the probability of that happening is very low. D. She should not be surprised that her raffle tickets are all winners because the probability of that happening is very high.
A brand name has a 60% recognition rate. Assume the owner of the brand wants to verify that rate by beginning with a small sample of 7 randomly selected consumers. What is the probability that 6 or 7 of the selected consumers recognize the brand name? The probability that at 6 or 7 of the selected consumers recognize the brand name is (Round to three decimal places as needed.)
ATV show, Lindsay and Tobias, recently had a share of 25, meaning that among the TV sets in use, 25% were tuned to that show. Assume that an advertiser wants to verify that 25% share value by conducting its own survey, and a pilot survey begins with 20 households having TV sets in use at the time of a Lindsay and Tobias broadcast. a. Find the probability that none of the households are tuned to Lindsay and Tobias. (Round to three decimal places as needed.)
A shuttle company has a policy of overbooking because based on past research, only 88% of people who buy their tickets actually show up to ride the shuttle. Their shuttles seat 19 passengers. If they sell 20 tickets, what is the probability that there will not be enough seats for the passengers? The probability of not enough seats will be (round your answer to 3 decimal places). Interpret this answer. Which of the following statements is true? O A. The shuttle company wants this number to be small. That way they can decrease their profit and regularly inconvenience their customers. O B. The shuttle company wants this number to be big. That way they can decrease their profit and regularly inconvenience their customers. O C. The shuttle company wants this number to be big. That way they can increase their profit, but do not regularly inconvenience their customers. O D. The shuttle company wants this number to be small. That way they can increase their profit, but do not regularly inconvenience their customers.
Find the standard deviation, o, for the binomial distribution which has the stated values of n and p. Round your answer to the nearest hundredth. n = 503; p = 0.7 O A. o 13.55 OB. o 14.40 O C. o=7.87 OD. o 10.28
Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. The method is designed to increase the likelihood that each baby will be a girl, but assume that the method has no effect, so the probability of a girl is 0.5. Assume that the groups consist of 27 couples. Complete parts (a) through (c) below. Pay attention to the rounding instructions on each problem below. a. Find the mean and the standard deviation for the numbers of girls in groups of 27 births. (Hint: binomial) The value of the mean (or the expected number of girls) is µ = (Type an integer or a decimal. Do not round.) The value of the standard deviation is o = (Round to one decimal place as needed.) b. Use your two previous answers to find the values separating results that are significantly low or significantly high. You should recall that "significantly low" refers to a value that is µ - 20 or lower and "significantly high" refers to a value that is μ + 20 or greater. Values of girls or lower are significantly low. (Round to one decimal place as needed.) Values of girls or greater are significantly high. (Round to one decimal place as needed.) C. Is the result of 23 girls a result that is significantly high? What does it suggest about the effectiveness of the method? The result ▼significantly high, because 23 girls is ▼ girls. Use one of the two answers you just found in part b above in the third blank.
Find the area of the shaded region. The graph depicts the standard normal distribution with mean 0 and standard deviation 1. Click to view page 1 of the table. Click to view page 2 of the table. The area of the shaded region is (Round to four decimal places as needed.) / z = 0.17
Find the area of the shaded region. The graph depicts the standard normal distribution of bone density scores with mean 0 and standard deviation 1. The area of the shaded region is (Round to four decimal places as needed.) Z=-0.84