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lesya692 [45]
3 years ago
12

Find the 90% confidence interval for the standard deviation for the time it takes an inspector to check a bus for safety if a sa

mple of 27 buses has a standard deviation of 6.8 minutes. assume the variable is normally distributed.
Mathematics
1 answer:
Aleks04 [339]3 years ago
7 0
<span><span> - </span>Find the 90% confidence interval for the standard deviation for the time it takes aninspector to check a bus for safety if a sample of 27 buses has a standard deviation of 6.8 minutes.Assume the variable is normally distributed. ... Best Answer: Let X be the time it takes an inspector tocheck a bus n = 27</span><span>[PDF]<span>Setiio/t 7. </span></span>
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Please hurry I will mark you brainliest
Igoryamba

Answer:

12500

Step-by-step explanation:

11830 - 10464 = 1366 (difference 1995 to 96)

10464 - 8958 = 1506 (94 to 95)

8958 - 8135 = 823

8135 - 7537 = 598

7537 - 6642 = 895

6642 - 5942 = 700

5942 - 3579 = 2363 (5 years)

so, we have the annual differences over 11 years.

the expectation for the following year would be based on the mean value of growth rate and not on the mean value of the absolute numbers, as we know the number of transactions for 1997 will be higher than for 1996.

so, the mean value of growth over these 11 years is 750.

so, based on this we would estimate for 1997

11830 + 750 = 12580 (12500 being the closest answer option).

but if the business environment has changed over the most recent years, we should not bring in earlier years into that calculation (or at least not with the same weight).

we could argue that the last 2 years had a totally different behavior than the years before.

so, just creating a mean value of the last 2 years' changes would be

(1366 + 1506) / 2 = 2872 / 2 = 1436.

now, or prediction would be

11830 + 1436 = 13266, which would be closer to the 13500 answer option.

6 0
3 years ago
A = 4r^2 solve for r2
Llana [10]
Not sure what you mean by solve for r^2 but a/4=r^2 if u wanna go further r=(a/4)^1/2
4 0
3 years ago
What is 78+5667-5467 equal to show work please
KatRina [158]
78+5667-5467= 278, 78+5667= 5745- 5467= 278
5 0
3 years ago
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Which of the following graphs depicts the graph of the given system of equations
vaieri [72.5K]

Answer: it is the x multiplied by the y axis


Step-by-step explanation:


8 0
3 years ago
A women sold a car for $1000, which was 25 percent more than the amount she had paid for the car. How much did she pay for the c
vfiekz [6]
1,000 times 0.25 = 250
So the answer is $1,000-250=$750
She paid $750 for the car.
8 0
3 years ago
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