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ohaa [14]
3 years ago
15

Sarah is going on a trip. she drives for 2 hours and 20 minutes, rests for 25 minutes and drives for another 2 hours and 40 minu

tes. what is her total travel time in hours and minutes​
Mathematics
1 answer:
kow [346]3 years ago
4 0

Answer:...,,,.

Step-by-step explanation:.....,l,,

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A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. A previous study indicates that the propo
never [62]

Answer:

A sample of 997 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the z-score that has a p-value of 1 - \frac{\alpha}{2}.

The margin of error is of:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

A previous study indicates that the proportion of left-handed golfers is 8%.

This means that \pi = 0.08

98% confidence level

So \alpha = 0.02, z is the value of Z that has a p-value of 1 - \frac{0.02}{2} = 0.99, so Z = 2.327.  

How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 2%?

This is n for which M = 0.02. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.02 = 2.327\sqrt{\frac{0.08*0.92}{n}}

0.02\sqrt{n} = 2.327\sqrt{0.08*0.92}

\sqrt{n} = \frac{2.327\sqrt{0.08*0.92}}{0.02}

(\sqrt{n})^2 = (\frac{2.327\sqrt{0.08*0.92}}{0.02})^2

n = 996.3

Rounding up:

A sample of 997 is needed.

3 0
3 years ago
Which expression has a value of 8?<br> 8x (5-4)<br> (8 x 5) – 4<br> (8 x 5-4)<br> 8 x 5 - 4
fomenos
8x5-4 is equal to 8 if that means 8 times 5 minus 4
4 0
3 years ago
12x² + 9x² =<br> A. 21x²²<br> B. 21x<br> C. 22x²<br> D. 22xA
Gnesinka [82]

Answer:

21x²

Step-by-step explanation:

hopefully A is a typo

3 0
2 years ago
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Last month a Carpenter made five tables this month he made 80% more than that how many tables do the carpenter make this month
Nataliya [291]

Answer:

9 tables

Step-by-step explanation:

5 × 1.8 = 9

to find how many tables he made you have to multiply the number he made by 1, then .(whatever the percent is)

4 0
3 years ago
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Find the LCM<br> of 9 and 27.
Mnenie [13.5K]

Answer:

27

Step-by-step explanation:

The answer is 27, because 9 x 3 = 27 and the smallest number that is the same is 27.

Hope this helps!

6 0
3 years ago
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