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Arte-miy333 [17]
3 years ago
6

Does anyone know when the tutors come for Brainly ?

Mathematics
1 answer:
katrin2010 [14]3 years ago
7 0
Their are no tutors
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From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 21.
zzz [600]

Answer: (20.86, 22.52)

Step-by-step explanation:

Formula to find the confidence interval for population mean :-

\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}

, where \overline{x} = sample mean.

z*= critical z-value

n= sample size.

\sigma = Population standard deviation.

By considering the given question , we have

\overline{x}= 21.69

\sigma=3.23

n= 58

Using z-table, the critical z-value for 95% confidence = z* = 1.96

Then, 95% confidence interval for the amount of time spent on administrative issues will be :

21.69\pm (1.96)\dfrac{3.23}{\sqrt{58}}

=21.69\pm (1.96)\dfrac{1.7}{7.61577}

=21.69\pm (1.96)(0.223221)

\approx21.69\pm0.83

=(21.69-0.83,\ 21.69+0.83)=(20.86,\ 22.52)

Hence, the 95% confidence interval for the amount of time spent on administrative issues = (20.86, 22.52)

7 0
3 years ago
Write the phrase as a mathematical expression. Use x as the variable.
11111nata11111 [884]

Answer:

4(2x+7) which is equal to 8x+28

4 0
2 years ago
If the slope of line L is -2/5, what is the slope of line m so that line l and line m are perpendicular?
ki77a [65]
Perpendicular lines have negative reciprocal slopes. So if the slope is -2/5...to find the negative reciprocal, " flip " the slope and change the sign.
So we flip -2/5 and we get 5/-2...and now we change the sign...and we get 5/2. So our perpendicular slope will be 5/2.
3 0
4 years ago
EY YO I NEED HELP 24x5<br><br> Who wants to talk lol
Reil [10]

Answer:

THE ANSWER IS 120

Step-by-step explanation:

AND SURE LETS TALKK

7 0
3 years ago
Read 2 more answers
Vanessa and Dominic are buying chicken for a barbecue. The table shows prices for different packages of chicken.
pishuonlain [190]

24-1 = 23

6-1/4 = 5 3/4

23/5 3/4 = 4

The constant is 4, so Vanessa is correct

The answer is:

D. Vanessa is correct because the quotient when dividing the values in the bottom row by the values in the top row is always 4.

8 0
3 years ago
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