Find the indicated probability using the geometric or Poisson distribution. Assume that the probability that you will make a sale on any given telephone call is 0.21. Find the probability that you will(a.) make your first sale on your fifth call,(b.) make your sale on the first, second or third call, and(c.)do not make a sale on your first three calls.

 

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Find the indicated area under the standard normal curve.

Between z= – 0.14 and z=0.14

The area between z= – 0.14 and z=0.14 under the standard normal curve is __. (round to four decimal places as needed).

 

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Find the incorrect parts in (a) of each question and correct them. Provide your ideas/opinions in (b) of each question

1.     (a) When light strikes a smooth surface with a 45 degree of incident angle, the reflected angle is always smaller than that. (b) Look around your house, car, or office building, and find some mirrors that do not have flat surfaces: concave or convex mirrors. Why do you think that they are curved, and for what usages?

 

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 2. Find the half-life of a radioactive material if after 1 year 99.57% of the initial amount remains.3. 14C dating assumes that the carbon dioxide on the Earth today has the same radioactive content as itdid centuries ago. If this is true, then the amount of 14C absorbed by a tree that grew several centuriesago should be the same as the amount of 14C absorbed by a similar tree today. A piece of ancientcharcoal contains only 15% as much of the radioactive carbon as a piece of modern charcoal. How longago was the tree burned to make the ancient charcoal? (The half-life of 14C is 5715 years.)4. The number of squirrels on the UCD campus increases continuously at a rate proportional to thenumber present. There are 150 present at a given time and 450 present 5 hours later.(a) How many will there be 10 hours after the initial time?(b) How long will it take for the population to double.(c) Does the answer to part (b) depend on the starting time? Explain your reasoning.5. The cumulative sales S (in thousands of units) of a new product after it has been on the market for tyears are modeled byS = Cek/t.During the first year, 5000 units were sold. The saturation point for the market is 30,000 units. Thatis, the limit of S as t → ∞ is 30,000.(a) Solve for C and k in the model.(b) How many units will be sold after 5 years?6. A small business assumes that the demand function for one of its new products can be modeled byp = Cekx. When p = $45, x = 1000 units, and when p = $40, x = 1200 units. Solve for C and k.7. The management of a factory finds that the maximum number of units a worker can produce in a dayis 30. The learning curve for the number of units N produced per day after a new employee has workedt days is modeled by N = 30(1 − ekt). After 20 days on the job, a worker is producing 19 units in aday. How many days should pass before this worker is producing 25 units per day?

2Find the half life of a radioactive material if after 1 year 99.57%of the initial amount remainst 1 hRadioactive decay formula : y 2 Where y final amount,t time, h half life So that,1 1 h…

 

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Question 2:

1. Set up a frequency distribution table and calculate the relative frequency for the following quiz scores that Matt achieved in his Algebra course:
2. Matt’s Quiz Scores: 87, 88, 92, 79, 100, 76, 61, 60, 79, 99, 100, 69, 98, 87, 92, 79, 81, 85, 100, and 100.
3. Use the following frequency intervals:
4. 60 – 69
5. 70 – 79
6. 80 – 89
7. 90 – 100
8. Calculate the variance and standard deviation for Matt’s quiz scores. Suggestion: set the problem up in steps within a table like the textbook illustrates.

 

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