A population has a variance of 169. We take a random sample of size 49 from this population. Let Xbar be the sample mean and let Xtot be the sample sum of our sample. These are random variables. a) What is the standard deviation of this population? b) What is the variance of 2*Xtot? (to three decimal places) c) What is the standard deviation of 2*Xtot? (to three decimal places) d) What is the variance of 2*Xbar? (to three decimal places). e) What is the standard deviation of 2*Xbar? (to three decimal places) f) What is the smallest sample size, n, which will make the standard deviation of Xtot at least 90? g) What is the smallest size sample, n, which will make the variance of Xtot at least 9000?

Q: Consider an iron blast furnace process. If 1200 kg of coke is used for every 1000 kg of iron ore,…

A: It is the example of direct proportion .  1200 kg of coke is used for every 1000 kg Therefore for 1…

Q: Justin is a teacher and takes home 76 papers to grade over the weekend. He can grade at a rate of 7…

A: It can be solved using maths concepts of word problems.

Q: Please answer questions 15 through 21 and show work for all of them! Thanks so much!

A:

Q: Water flows out of a hose at a rate of 6 gallons per minute. A pool is 22 feet by 38 feet by 6 feet.…

A: Given: A pool is 22 feet by 38 feet by 6 feet. Water flows out of hose at a rate of 6 gallons per…

Q: 4. Describe how a drywaller might use a formula to estimate the number of sheets of drywall needed…

A: To calculate number of sheets of drywall a drywaller use the following formula.

Q: 11 ft 467H

A:

Q: The amount of water required for a yard which has been landscaped for a desert environment is 17% of…

A: The value of x% of y is calculated using the formula below.

Q: The White River flows at a rate of 4 km/h. In order for a boat to travel 76.8 km upriver and then…

A: Let x be the speed of water still in water. Then, Upstream speed is x-4 and downstream speed is x+4.…

Q: Liam purchased 6 ounces of medical marijuana that was priced at $300 per pound. Using the methods of…

A: dimensional analysis is the method of converting one unit to another.

Q: Provide a numerical quantity that accurately represents each of the following situations. In a…

A: Let's consider a reference value to be zero. In such case: (i) If the given quantities are…

Q: How many calories per day does a person who weighs 80 kilograms (approximately 176 pounds) need to…

A: Given, A person weighs 80 kilograms. To find how many calories per day a person needs: The function…

Q: The annual rainfall in Albany is 0.33 inch less rgr annual rainfall in Nashville. How much less…

A:

Q: .A car travels 20 kph faster than a truck. The car goes 360 km in 3 hours less than the truck  goes…

A:

Q: DO Geomery Write and simplify an expression for the volume of each figure. 44. Fadusob hesht-abc…

A: As per bartleby guidelines we only give first question answer.

Q: a 350 gallon spray tank can covers 14 acres find the rate of application in gallons per acre

A: Given 350 gallon spray tank can covers 14 acres

Q: If you have to fly from JFK airport in New York to LAX airport in Los Angeles, you will fly 2,475…

A: In this question we have to find the average speed of the Plane

Q: Rounded to the nearest tenth, Jupiter is how many times further from the sun than the earth is from…

A: Data taken from NASA website : The table below gives the distance from the Sun of the eight planets…

Q: You are working for a company designing and manufacturing high-end picture frames. For a new…

A:

Q: A plate 67.68 millimeters thick is to be machined to a thickness of 52.7 millimeters. The plate is…

A: Given  Thickness of a plate = 67.68 millimeters  The plate is machined to the thickness of 52.7…