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Aloiza [94]
2 years ago
5

HELP ASAP

Mathematics
1 answer:
suter [353]2 years ago
6 0

That sounds horrible

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A random sample of n measurements was selected from a population with unknown mean μ and known standard deviation σ. Calculate a
vivado [14]

Answer:

The 95% confidence interval for μ for the given situation is between 87.49 and 94.51.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.96\frac{20}{\sqrt{125}} = 3.51

The lower end of the interval is the sample mean subtracted by M. So it is 91 - 3.51 = 87.49

The upper end of the interval is the sample mean added to M. So it is 91 + 3.51 = 94.51

The 95% confidence interval for μ for the given situation is between 87.49 and 94.51.

5 0
3 years ago
Read 2 more answers
The first hole of a golf course is 250 metres long. A golfer hits her drive exactly 250 m,
Serga [27]

Answer: A golfer finds himself in two different situations on different holes. On the second hole he is 120 m from the green and wants to hit the ball 90 m

Step-by-step explanation:

7 0
1 year ago
( 2 x - 3 ) ( 7 x + 4) polynomials
Taya2010 [7]

Answer:

14x-12

Step-by-step explanation:

Simplify (2x-3)(7x+4).

Expand the brackets. Remember brackets mean to multiply.

We multiply the 2x and the 7x to get 14x and we multiply the -3 by 4 to get -12 as shown below;

(2x-3)(7x+4)

14x-12

6 0
3 years ago
Fabian harvests 10 pounds of tomatoes from his garden he needs 2 2/5 pound to make a batch of soup. If he sets aside 2.8 pounds
dusya [7]
He can make 3 batches of soup.

Starting with 10 pounds of tomatoes and taking out the number of pounds he sets aside for spaghetti sauce, 2.8, we have:
10-2.8 = 7.2 pounds left.

0.2 is read as "two tenths," so 7.2 = 7 2/10

We divide this remaining number of pounds by 2 2/5 for each batch of soup:

7 2/10 ÷ 2 2/5

Convert each to an improper fraction:
72/10 ÷ 12/5

Multiply by the reciprocal:
72/10 × 5/12 = 360/120 = 3
6 0
3 years ago
CAN ANYONE HELP ME PLEASE 20 POINT!!!
cricket20 [7]

Answer:

the answer should be B -3

Step-by-step explanation:

1+3-5-2= -3

6 0
3 years ago
Read 2 more answers
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