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scZoUnD [109]
2 years ago
13

Every four years is a leap year. If a year is randomly chosen, what is the probability that it will NOT be a leap year?

Mathematics
1 answer:
Aloiza [94]2 years ago
5 0

Answer:

3/4.

Step-by-step explanation:

There are 3 non leap years  in every 4 year period so it s 3/4.

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Scores on a college entrance exam are normally distributed with a mean of 550 and a standard deviation of 100. Find the value th
Alinara [238K]

Answer:

The value that represents the 90th percentile of scores is 678.

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 = 550, \sigma = 100

Find the value that represents the 90th percentile of scores.

This is the value of X when Z has a pvalue of 0.9. So X when Z = 1.28.

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

1.28 = \frac{X - 550}{100}

X - 550 = 100*1.28

X = 678

The value that represents the 90th percentile of scores is 678.

4 0
3 years ago
This is adding and subtracting rational expressions. i don’t know how to do this one
Sindrei [870]

Answer:

1

Step-by-step explanation:

1-0=1 totally trust me

5 0
3 years ago
The difference of two number is 1. Their sum is 11. Find the numbers
evablogger [386]
I think the answer is 6 and 5 because 6+5=11 and 6-5=1
5 0
2 years ago
Read 2 more answers
15
BartSMP [9]

Answer:

B.

Step-by-step explanation:

Causation is often confused with correlation because they are so similar. B would mean that pollution is caused from something (lets say greenhouse gases for example) which then results in more cases of heart disease.

Causation is when the first variable may bring the second into existence or may cause the incidence of the second variable to fluctuate. So, causation is the capacity of one variable to influence another. Which, would make B, a suitable candidate.

8 0
3 years ago
I WILL MARK BRAINEST PLSS HELP DUE SOON
AveGali [126]

Answer:

I pretty sure it is b and d plz give brainlyiest

Step-by-step explanation:

7 0
3 years ago
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