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sveta [45]
2 years ago
6

I’ll give extra points

Mathematics
1 answer:
sleet_krkn [62]2 years ago
4 0

Answer:

C

Step-by-step explanation:

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after two tests carol has a total score of 170. the score on her first test was 8 points higher than the score on her second tes
RoseWind [281]
X stands for the score of her first test
Y stands for the score of her second test

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2 years ago
Help plz:))) I’ll mark u brainliest
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X=-1 give me thanks :)
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Do you estimate that 200 people attend a school concert. The actual attendance was 240 people find the percent error
harkovskaia [24]
The percent error is 20%.
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3 years ago
It appears that people who are mildly obese are less active than leaner people. One study looked at the average number of minute
fredd [130]

Answer:

0.0322; 0.9929

Step-by-step explanation:

Since the data is normally distributed, we use z scores for these probabilities.

The formula for a z score of a sample mean is

z=\frac{\bar{X}-\mu}{\sigma \div \sqrt{n}}

For the sample of mildly obese people, the mean, μ, is 371; the standard deviation, σ, is 65; and the sample size, n, is 6.

Using 420 for X,

z = (420-371)/(65÷√6) = 49/(65÷2.4495) = 49/26.5360 ≈ 1.85

Using a z table, we see that the area under the curve to the left of this is 0.9678.  However, we want the area to the right, so we subtract from 1:

1-0.9678 = 0.0322

For the sample of lean people, the mean, μ, is 528; the standard deviation, σ, is 108; the sample size, n, is 6.

Using 420 for X, we have

z = (420-528)/(108÷√6) = -108/(108÷2.4495) = -108/44.0906 ≈ -2.45

Using a z table, we see that the area under the curve to the left of this is 0.0071.  We want the area under the curve to the right, so we subtract from 1:

1-0.0071 = 0.9929

7 0
2 years ago
You have 36 coins. the ratio of heads to tails is 3 to 1. how many coins are heads?
pentagon [3]
3 + 1 = 4. 36/4=9. 3×9=27. There were 27 heads.
7 0
3 years ago
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