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BaLLatris [955]
3 years ago
13

Alex types 1/2 of a page in 1/2 an hour. How long will it take him to type 1 page?

Mathematics
1 answer:
muminat3 years ago
5 0
B. 1 hour, he takes the exact amount of time that he types.
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You work for a marketing firm that has a large client in the automobile industry. You have been asked to estimate the proportion
quester [9]

Answer:

The sample size must be approximately 1067 to get a margin of error of 0.03.

Step-by-step explanation:

We are given the following in the question:

Margin of error = 0.03

Significance level = 5%

Margin of error =

z_{stat}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}

Since, no prior proportions are given, we take

\hat{p} = 0.5

z_{critical}\text{ at}~\alpha_{0.05} = 1.96

Putting values, we get,

0.03 = 1.96\sqrt{\dfrac{0.5(1-0.5)}{n}}\\\\\sqrt{n} = \dfrac{1.96\times 0.5}{0.03}\\\\\\sqrt{n} = 32.67\\n = 1067.3289\approx 1067

Thus, the sample size must be approximately 1067 to get a margin of error of 0.03.

3 0
3 years ago
Evaluate this question
cestrela7 [59]

Answer:

d.

Step-by-step explanation:

\bigg( \frac{16}{49}  \bigg)^{  - \frac{3}{2} }  \\  \\  =  \bigg( \frac{49}{16}  \bigg)^{ \frac{3}{2} }  \\  \\  =  \bigg( \frac{ {7}^{2} }{ {4}^{2} }  \bigg)^{ \frac{3}{2} }  \\  \\  =  \bigg( \frac{ {7}}{ {4} }  \bigg)^{ \frac{2 \times 3}{2} }  \\  \\  =  \bigg( \frac{ {7}}{ {4} }  \bigg)^{ 3}   \\  \\  =  \frac{343}{64}  \\

3 0
3 years ago
In a group of 42 children there r twice as many boys as girls how many girls r there
777dan777 [17]
14 girls are there!           
4 0
3 years ago
Read 2 more answers
Using appropriate properties , find 7/5 × 5/12 − 3/12 × 7/5 − 1/15
Mazyrski [523]

Answer:

\frac{1}{6}

Step-by-step explanation:

\frac{7}{5}  \times  \frac{5}{12}  -  \frac{3}{12}  \times  \frac{7}{5}  -  \frac{1}{15}  =  \frac{7}{5} ( \frac{5}{12}   -  \frac{3}{12} ) -  \frac{1}{15}  =  \frac{7}{5}  \times  \frac{1}{6}  -  \frac{1}{15}  =  \frac{7}{30}  -  \frac{2}{30}  =  \frac{5}{30}  =  \frac{1}{6}

8 0
2 years ago
William purchased 76.9 feet of fencing for his back yard. He realized after measuring, that he still needed an additional 25.7 f
Lostsunrise [7]
William needs 102.6 fencing in all because 76.9 plus 25.7 equals 102.6, hope this helps!
3 0
3 years ago
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