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Margaret [11]
3 years ago
15

In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fu

el pump in a car. How large a sample must he select if he wants to be 90% confident that the average time is within 20 minutes of the sample average? Assume the standard deviation of all times is 40 minutes.
Mathematics
1 answer:
Ede4ka [16]3 years ago
4 0

Answer:

ME = 1.96(45)/sqrt(n) 25 = 1.96(45)/sqrt(n) n = (1.96(45)/25)^2 = 6

Step-by-step explanation:

yw

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the height of a tree was 12 feet. after a year, the tree's height increased 25%. what is the height of the tree after a year
Margaret [11]

Answer:

15 feet

Step-by-step explanation:

7 0
3 years ago
Determine the domain and range of the function f(x)= 3x+2. Also, state the intervals where the function f(x)= 3x+ 2 is increasin
aev [14]

Answer:

Increasing on it's domain (-\infty,\infty) because the slope is positive.

The domain and range are both all real numbers, also known as

(-\infty,\infty).

Step-by-step explanation:

All domain really means is what numbers can you plug in and you get number back from your function.

I should be able to plug in any number into 3x+2 and result in a number. There are no restrictions for x on 3x+2.

The domain is all real numbers.

In interval notation that is (-\infty,\infty).

Now the range is the set of numbers that get hit by y=3x+2.

Well y=3x+2 is a linear function that is increasing.  I know it is increasing because the slope is positive 3. I wrote out the positive part because that is the item you focus on in a linear equation to determine if is increasing or decreasing.

If slope is positive, then the line is increasing.

If slope is negative, then the line is decreasing.

So y=3x+2 hits all values of y because it is increasing forever.  The range is all real numbers. In interval notation that is (-\infty,\infty).

3 0
3 years ago
7x + 3x + x⁴ divided by x-2 using long division​
VARVARA [1.3K]

Answer:

10x + x^4/x-2

Step-by-step explanation:

Combine like terms

(10x + x^4)/(x-2)

4 0
1 year ago
Read 2 more answers
Q) The distance between points A(2,1) and B(2,4) is ___ units.
madreJ [45]

Answer:

3 or (0,3)

Step-by-step explanation:

8 0
3 years ago
Which pair of data sets would most likely have no correlation?
kaheart [24]

Answer:

The first one is correct.

Hope this helps

Mark me brainliest if I'm right :)

7 0
3 years ago
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