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3 years ago

Which of the following statements is true?

Mathematics

1 answer:

andrezito [222]3 years ago

3 0

The correct answer is C.

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A college administrator would like to estimate the average grade point average (average of GPA) of all the current registered st

bonufazy [111]

Answer: 346

Step-by-step explanation:

Given : Margin of error : E= 0.05

Standard deviation : $\sigma=0.4$

Significance level : $\alpha=1-0.9=0.1$

Critical value : $z_{\alpha/2}=1.645$

The formula to calculate sample size ( if proportion is known) :-

$n=(\dfrac{z_{\alpha/2}\sigma}{E})^2\\\\\Rightarrow\ n=(\dfrac{(2.326\times0.4)}{0.05})^2\\\\\Rightarrow\ n=346.257664\approx346$

Hence, the required minimum sample would be 346.

8 0

2 years ago

Chris and Goffy ran from Newton to Boston at 15 km/h and 12 km/h respectively. They both started from Newton at 10:00 a.m. If Go

zavuch27 [327]

Answer: Chris reached Boston at 10:24 a.m.

Explanation:

Since we have given that

Speed at which Chris ran from Newton to Boston = 15 km/h

Speed at which Goffy ran from Newton to Boston = 12 km/h

Time at which both started = 10:00 a.m.

Time at which Goffy reached Boston = 10:30 a.m.

That means Goffy takes half an hour to reach Boston,

so, Distance between Newton and Boston is given by

$Speed \times Time\\\\=12\times \frac{1}{2}=6 \ km$

So, Time taken by Chris to ran from Newton and Boston is given by

$Time=\frac{Distance}{Speed}=\frac{6}{15}=\frac{2}{5}\times 60\ minutes=24\ minutes\\$

So, Chris reached Boston at 10:24 a.m.

8 0

3 years ago

Read 2 more answers

Please help me with this question!! Thank you so much, it should be quick. I need to know what goes in the blank space above.

34kurt

If two objects have the same shape, they are called "similar." When two figures are similar, the ratios of the lengths of their corresponding sides are equal so the word is ratio

6 0

2 years ago

Melissa plans to purchase a pair of jeans for $39.95. She wants to bring enough money to pay for the jeans plus the sales tax, w

adelina 88 [10]

You have to calculate the 8.25% of $39.95, then add the numbers together.
So: 8.25% of 39.95 = 3.3 (approximately)
The total is 39.95 + 3.3 = 43.25

Another method is to simply calculate the 108.25% of 39.95, you can get this by multiplying 39.95 with 1.0825.

6 0

2 years ago

74,308 Problem: Round the number above to the nearest ten.

Nikitich [7]

Answer:

74,310

Hope this helped! ^^

6 0

2 years ago

Read 2 more answers