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MATH SOLVE
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Assume the random variable X is normally distributed with mean muequals50 and standard deviation sigmaequals7. Compute the probability. Be sure to draw a normal curve with the area corresponding to the probability shaded. P(55less than or equalsXless than or equals70)
General
2 months ago
Thetime(inhours)requiredtorepairamachineis an exponentially distributed random variable with parameter λ = 1 . What is 2 (a) the probability that a repair time exceeds 2 hours? (b) the conditional probability that a repair takes at least 10 hours, given that its duration exceeds 9 hours?
General
2 months ago
An online magic 8 ball has 20 response options, 5 of which are neutral. An instructor claims that the responses are all equally likely to occur and that the proportion of neutral responses is .25. A student is skeptical of this claim, believing that neutral responses are less likely. The student queries the magic 8 ball 50 times and gets 9 neutral responses. Is there convincing evidence that less than 25% of responses are neutral? What are the appropriate hypotheses for this test?
General
2 months ago
Please, I need help on this question. Drag each graph to show whether it is a function of x or not a function of x. If there is not enough information to tell, drag the graph into the box under “Not Enough Information.”
General
2 months ago
Assume a Poisson random variable has a mean of 6 successes over a 120-minute period a. Find the mean of the random variable, defined by the time between successes Mean b. What is the rate parameter of the appropriate exponential distribution? (Round your answer to 2 decimal places.) Rate parameter C. Find the probability that the time to success will be more than 60 minutes. (Round intermediate calculations and final answer to 4 decimal places.) Probability
General
2 months ago
It takes machine A x hours to manufacture a deck of cards that machine B can manufacture in y hours. If machine A operates alone for z hours and is then joined by machine B until 100 decks are finished, for how long will the two machines operate simultaneously?
General
2 months ago
As part of a study of the treatment of anemia in cattle, researchers measured the concentration of selenium in the blood of 36 cows who had been given a dietary supplement of selenium (2 mg/day) for one year. The cows were all the same breed and had all borne their first calf during the year. The mean selenium concentration was 6.21 μg/dl and the standard deviation was 1.84 μg/dl.16 Construct a 95% confidence interval for the population mean.
General
2 months ago
Assume a recent sociological report states that university students drink 4.10 alcoholic drinks per week on average, with a standard deviation of 1.9101. Suppose Jason, a policy manager at a local university, decides to take a random sample of 125 university students to survey them about their drinking habits. Determine the mean and standard deviation of the sampling distribution of the sample mean alcohol consumption. Provide your answer with precision to two decimal places. Mean of sampling distribution = standard deviation of sampling distribution =
General
2 months ago
The Customer Service Department has prepared its Statement of Operations. Match the different heads to the amount by which the accountant has over or under budgeted the actual expenses. under budgeting of $2,000 over budgeting of $2,000 over budgeting of $200 under budgeting of $200 under budgeting of $20 over budgeting of $20 actual payroll expenses - $120,000 budgeted payroll expenses - $122,000 arrowRight actual fringe benefits -$14,000 budgeted fringe benefits - $12,000 arrowRight actual travel expenses - $1,000 budgeted travel expenses -$1,200 arrowRight actual professional expenses -$2,450 budgeted professional expenses - $2,250 arrowRight actual general expenses - $3,220 budgeted general expenses - $3,200 arrowRight
General
2 months ago
In triangle ΔABC, ∠C is a right angle and CD is the height to AB. Find the angles in ∠ACD and ∠BCD if: m∠A = 65°
General
2 months ago
The table lists the number of pitches seen by a player in 6 games. What is the mean of the data set? 11 14.5 18.5 20 Done Game Pitches Seen 1 25 2 20 3 20 4 17 5 15 6 14
General
2 months ago
In isosceles ∆ABC the segment BD (with D ∈ AC ) is the median to the base AC . Find BD, if the perimeter of ∆ABC is 50m, and the perimeter of ∆ABD is 40m.
General
2 months ago
Carlos bought a new Mastercraft boat for $17,000. He made a $2,500 down payment on it. The bank's loan was for 60 months, and the finance charges totaled $4,900. What's his monthly payment? A. $323.33 B. $232.33 C. $313.33 D. $332.33
General
2 months ago
Find the interest rate for the given deposit and compound amount. $4600 accumulating to $5994.78, compounded monthly for 4 years.
General
2 months ago
A collection of dimes and nickels is worth $5.60. The ratio of dimes to nickels is 3:2. How many dimes and how many nickels are there?
General
2 months ago
Robin's family breeds Great Danes. In the last litter, one of the puppies grew at an unusually consistent rate. At birth, he weighed two pounds. At eight months, he weighed 110 pounds.
General
2 months ago
It is the morning of the sandcastle-building competition at the beach. Dory has been looking forward to this event for months. According to her weather app, there is an 80% probability of high winds in her area today. Which of the following BEST describes the MOST likely way the probability was determined?
General
2 months ago
Ajax buys 20 shares of stock at 20$ per share. The shares increase in value by 20%. He then sells 10 shares. After the shares decrease in value by 10%, he buys another 20 shares. The shares then all increase by 50%. Determine the total dollar value of the 30 shares that Ajax now owns.
General
2 months ago
Which mathematical symbol would best fill in the blank to compare the two real numbers?square root of 7 blank 14 over 5<>=≈
General
2 months ago
The perimeter of the isosceles ΔABC with the base BC is equal to 40 cm. Perimeter of the equilateral ΔBCD is 45 cm. Find BC and AB.
General
2 months ago
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