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Amiraneli [1.4K]
3 years ago
11

Determine the mean of the following numbers: 28, 40, 53, 39, and 45.

Mathematics
2 answers:
MatroZZZ [7]3 years ago
6 0

Answer:

the mean is 33.8.  What you do second is divide the total by how many numbers there are so 5.

Step-by-step explanation:

VladimirAG [237]3 years ago
4 0

Answer:

Add all the numbers and divide by how many numbers are there.

Step-by-step explanation:

28+40+53+39+45 = 205

205/5 = 41

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vova2212 [387]

The First two coefficients are positive because they are on the positive side of the y-axis.

The Last two are on the negative side of the y-axis. B is the closest to zero as the wider the graph is, the lower the coefficient is.

The coefficient with the greatest value would be D

6 0
3 years ago
An English professor assigns letter grades on a test according to the following scheme. A: Top 9% of scores B: Scores below the
sergeinik [125]

Answer:

The minimum score required for an A grade is 83.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Mean of 72.3 and a standard deviation of 8.

This means that \mu = 72.3, \sigma = 8

Find the minimum score required for an A grade.

This is the 100 - 9 = 91th percentile, which is X when Z has a pvalue of 0.91, so X when Z = 1.34.

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

1.34 = \frac{X - 72.3}{8}

X - 72.3 = 1.34*8

X = 83

The minimum score required for an A grade is 83.

5 0
2 years ago
The sum of two numbers is 64 and their differences in 10. Find the numbers
uranmaximum [27]

Answer:

37 and 27

Step-by-step explanation:

Lets say that the two numbers are x and y. We get the equations x + y = 64 and x - y = 10. We can then add these two equations together to get, 2x = 74. Then we divide by two on both sides and get x = 37. We then plug this value back into the second equation and get that 37 - y = 10. We can simplify this and we get that y = 27. So our two numbers are 37 and 27.

4 0
2 years ago
Read 2 more answers
The population of Williston is currently 21,200 people. If the population
Pachacha [2.7K]

21200 + 415(y)

27000 = 21200 + 415(y)

27000 - 21200 = 21200 - 21200 + 415(y)

5800 = 415(y)

\frac{5800}{415}  =  \frac{415(y)}{415}

13.9759..... = y

it \: will \: take \: about \: 14.0 \: years

8 0
2 years ago
Evaluate the expression when a=14 and b=6. 5b/32a2
leonid [27]

Answer:

28/16071  as a decimal 0.00174226...

Step-by-step explanation:

Hope this helps!

5 0
3 years ago
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