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ANEK [815]
2 years ago
13

Mike's electronics store sold the following number of cellphones on each of the seven days of a week. DayCell Phones Sold Sunday

12 Monday10 Tuesday9 Wednesday5 Thursday14 Friday10 Saturday10 The mean number of cell phones sold by the store for the week was __________. 9 phones 70 phones 10 phones 5 phones
Mathematics
1 answer:
bulgar [2K]2 years ago
6 0

Answer:

  (c)  10 phones

Step-by-step explanation:

The mean is the sum divided by the number of contributors:

  (12 +10 +9 +5 +14 +10 +10)/7 = 70/7 = 10

The mean number of phones sold for the week was 10 phones.

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A 4-cup bottle of vegetable oil costs 2.80. What is the price per pint
german

Answer:

$1.40 per pint

Step-by-step explanation:

4 cups is the same as 2 pints.

If 2 pints cost $2.80

divide $2.80 by 2

and get $1.40 per pint

8 0
3 years ago
A sock drawer contains 18 blue socks and 10 black socks. If two socks are randomly drawn from the drawer without replacement, wh
harina [27]
I wanna say 1/14 but I'm really not sure
4 0
3 years ago
Read 2 more answers
"a pollster wishes to estimate the number of left-handed scientists. how large of a sample is needed in order to be 98% confiden
nadezda [96]
The sample size should be 250.

Our margin of error is 4%, or 0.04.  We use the formula

\text{ME}=z\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}

To find the z-score:
Convert 98% to a decimal:  0.98
Subtract from 1:  1-0.98 = 0.02
Divide both sides by 2:  0.02/2 = 0.01
Subtract from 1:  1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value has a z-score of approximately 2.33.  Using this, our margin of error and our proportion, we have:

0.04=2.33\sqrt{\frac{0.08(1-0.08)}{n}}
\\
\\0.04=2.33\sqrt{\frac{0.08(0.92)}{n}}

Divide both sides by 2.33:
\frac{0.04}{2.33}=\sqrt{\frac{0.08(0.92)}{n}}

Square both sides:
(\frac{0.04}{2.33})^2=\frac{0.08(0.92)}{n}

Multiply both sides by n:
(\frac{0.04}{2.33})^2n=0.08(0.92)

Divide both sides to isolate n:
\frac{0.08(0.92)}{(\frac{0.04}{2.33})^2}=n
\\
\\249.73=n
\\n\approx 250
4 0
3 years ago
6 cm<br> 4 cm<br> 7 cm<br> It’s a rectangular pyramid.
Vikki [24]

<em>HOPE</em><em> </em><em>THIS</em><em> </em><em>WILL</em><em> </em><em>HELP</em><em> </em><em>U</em><em>.</em><em>.</em><em>.</em>

7 0
2 years ago
Read 2 more answers
Mark bought three pairs of shorts and one pair of shoes. If the shoes cost $25 and he spent
Aleonysh [2.5K]

Answer:

17.95 :)

Step-by-step explanation:

25-78.85= 53.85, and 53.85/3= 17.95 so each pair of shorts costed 17.95

8 0
3 years ago
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