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Use the strategy for solving word problems, translating from the verbal conditions of the problem to a linear inequality. You are choosing between two telephone plans. Plan A has a monthly fee of $15 with a charge of $0.08 per minute for all calls. Plan B has a monthly fee of $3 with a charge of $0.12 per minute for all calls. How many calling minutes in a month make plan A the better deal?
General
5 months ago
A computer can be classified as either cutting dash edge or ancient. Suppose that 86% of computers are classified as ancient. (a) Two computers are chosen at random. What is the probability that both computers are ancient? (b) Seven computers are chosen at random. What is the probability that all seven computers are ancient? (c) What is the probability that at least one of seven randomly selected computers is cutting dash edge? Would it be unusual that at least one of seven randomly selected computers is cutting dash edge?
General
5 months ago
A data set includes 103 body temperatures of healthy adult humans having a mean of 98.3degreesF and a standard deviation of 0.73degreesF. Construct a 99% confidence interval estimate of the mean body temperature of all healthy humans. What does the sample suggest about the use of 98.6degreesF as the mean body temperature?
General
5 months ago
A doctor is interested in people who have experienced an unexplained episode of vitamin D intoxication. She took a SRS of size 12 from the people who have experienced an unexplained episode of vitamin D intoxication and measured the calcium level in mmol/l in each individual. The sample mean is x = 2.87 mmol/l. Assume that the distribution of the calcium level of people with an unexplained episode of vitamin D intoxication is normally distributed with standard deviation of σ = 0.40.(a) Calculate a 99% confidence interval for μ = the true mean calcium level of the population of people who experienced an unexplained episode of vitamin D intoxication. Choose the answer closest to your answer.(2.573, 3.167)(2.784, 2.956) (0.294, 5.446)(2.643, 3.096)We can't answer this question because we don't know the shape of the distribution of the sample mean.(b) Which of the following is the best interpretation of the interval calculated above?We are 99% confident that the average sample mean calcium level of all people who have experienced an unexplained episode of vitamin D intoxication is in the interval.There is a 99% probability that the average calcium level of all people who have experienced an unexplained episode of vitamin D intoxication is in the interval. We are 99% confident that the average calcium level of all people who have experienced an unexplained episode of vitamin D intoxication is in the interval.1% of the time the confidence interval doesnt contain x.None of the above.
General
5 months ago
A quality engineer in a light bulb factory is planning a study to estimate the average life of a large shipment of light bulbs. The engineer wants to estimate the average life within plus or minus 15 hours with 95 percent confidence. Assuming a process standard deviation of 100 hours, determine the sample size for this study
General
5 months ago
A pyramid has a square base that is 160 m on each side. What is the perimeter of the base in kilometers?
General
5 months ago
Calculus homework, plzzzzz helplppp
General
5 months ago
3. Brenda's school is selling tickets to a spring musical. On the first day ofticket sales the school sold 3 senior citizen tickets and 9 child tickets for a totalof $75. The school took in $67 on the second day by selling 8 senior citizentickets and 5 child tickets. What is the price each of one senior citizen ticketand one child ticket?
General
5 months ago
A metal alloy is a metal made by blending 2 or more types of metal. A jeweler has supplies of two metal alloys. One alloy is 30% gold and the other is 10% gold. How much of each alloy should the jeweler combine to create 4 kg of an alloy containing 15% gold?
General
5 months ago
At a concert, 2/5 of the people were men. There were 3 times as many women as children. If there were 45 more men than children, how many people were there at the concert?
General
5 months ago
Use the properties of geometric series to find the sum of the series. for what values of the variable does the series converge to this sum? 5+(−10)z+20z2+(−40)z3+⋯
General
5 months ago
Use lagrange multipliers to find three positive numbers whose sum is 120 and whose product is maximum. (enter your answers as a comma-separated list.) (40,40,40) incorrect: your answer is incorrect.
General
5 months ago
Starting from the same place, Ryu walks due west and Samantha walks due east.On the number line, 0 represents their starting point, negative values represent the distance traveled west and positive values represent the distance traveled east. All values are given in feet.A number line with a point for Samantha at coordinate 40 and a point for Ryu at coordinate -160.How many feet apart are Ryu and Samantha on the number line?
General
5 months ago
A debt of $450 is to be shared equally among the members of the Outing Club. When five of the members refuse to pay, the other members’ shares each go up by $3. How many members does the Outing Club have?
General
5 months ago
A parabola has its focus at (1,2) and its directrix is y=-2. the equation of this parabola could be
General
5 months ago
The weight of corn chips dispensed into a 14-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean of 14.5 ounces and a standard deviation of 0.2 ounce. suppose 100 bags of chips are randomly selected. find the probability that the mean weight of these 100 bags exceeds 14.6 ounces.
General
5 months ago
A candy store sells a bag of cotton candy for $0.70 and chocolate bars for $0.50. Sheila bought some cotton candy and several chocolate bars from the store and spent a total of $6.30. How many bags of cotton candy and bars of chocolate did Sheila purchase?A 4B 7C 11D 13E 17
General
5 months ago
A jewelry box with a square base is to be built with silver plated sides, nickel plated bottom and top, and a volume of 30 cm3. if nickel plating costs $1 per cm2 and silver plating costs $3 per cm2, find the dimensions of the box to minimize the cost of the materials
General
5 months ago
ming rolls a number cube, tosses a coin, and chooses a card from two cards marked a and b. if an even number and heads appears, ming wins, no matter which card is chosen. otherwise lashonda wins. find p(ming wins)
General
5 months ago
The displacement, d, in millimeters of a tuning fork as a function of time, t, in seconds can be modeled with the equation mc001-1.jpg. What is the maximum displacement of the tuning fork? 0.2 mm 0.4 mm 0.8 mm 2.5 mm
General
5 months ago
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