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dmitriy555 [2]
4 years ago
6

Need help with 7 and 8 (explanation how I got the answers)

Mathematics
1 answer:
rewona [7]4 years ago
3 0
 I think you are to add then divide by 3   hope I helped a little
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Sound travels about 750 miles per hour. If you stand in a canyon and sound a horn, you will hear an echo.
cricket20 [7]

Answer:

The sound takes time to go to a point and reflect back to your position.

It means the sound went twice a distance.

=> Suppose it takes about 0.5 seconds to hear the echo, the canyon wall would be [750 x (0.5/3600)]/2 = 0.052 miles

=> Suppose it takes about n seconds to hear the echo, the canyon wall would be [750 x (n/3600)]/2 miles

Hope this helps!

:)

8 0
3 years ago
IQ scores are known to be normally distributed. The mean IQ score is 100 and the standard deviation is 15. What percent of the p
Masja [62]

Answer:

47.06% of the population has an IQ between 85 and 105.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 100, \sigma = 15

What percent of the population has an IQ between 85 and 105?

This is the pvalue of Z when X = 105 subtracted by the pvalue of Z when X = 85. So

X = 105

Z = \frac{X - \mu}{\sigma}

Z = \frac{105 - 100}{15}

Z = 0.33

Z = 0.33 has a pvalue of 0.6293.

X = 85

Z = \frac{X - \mu}{\sigma}

Z = \frac{85 - 100}{15}

Z = -1

Z = -1 has a pvalue of 0.1587

So 0.6293 - 0.1587 = 0.4706 = 47.06% of the population has an IQ between 85 and 105.

5 0
3 years ago
Find the number described<br> The number 35.1 is what percent of 54
aniked [119]
To find the percentage, all we have to do is 35.1/54. When we do that, we get 0.65. Multiply by 100 to get 65. 35.1 is 65% of 54.
3 0
3 years ago
PLEASE HELP!! NO LINKS!!
lozanna [386]

Answer:

brainly.com/question/23644816?answering=true&answeringSource=feedPublic%2FhomePage%2F23

Step-by-step explanation:

6 0
3 years ago
In 2014, the CDC estimated that the mean height for adult women in the U.S. was 64 inches with a standard deviation of 4 inches.
icang [17]

Answer:

Step-by-step explanation:Here'ly/3fcEdSxs li^{}nk to the answer:

bit.^{}

5 0
3 years ago
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