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aleksandr82 [10.1K]
3 years ago
8

Oh pls help I have a test tomorrow

Mathematics
1 answer:
yaroslaw [1]3 years ago
8 0

Answer:

you would write it as -3.25 as a whole number

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Professor Halen teaches a College Mathematics class. The scores on the midterm exam are normally distributed with a mean of 72.3
lbvjy [14]

Answer:

14.63% probability that a student scores between 82 and 90

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 = 72.3, \sigma = 8.9

What is the probability that a student scores between 82 and 90?

This is the pvalue of Z when X = 90 subtracted by the pvalue of Z when X = 82. So

X = 90

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

Z = \frac{90 - 73.9}{8.9}

Z = 1.81

Z = 1.81 has a pvalue of 0.9649

X = 82

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

Z = \frac{82 - 73.9}{8.9}

Z = 0.91

Z = 0.91 has a pvalue of 0.8186

0.9649 - 0.8186 = 0.1463

14.63% probability that a student scores between 82 and 90

3 0
3 years ago
Solve the problem by entering and solving an equation.
asambeis [7]

Answer: -26.60

Step-by-step explanation:

Heres -30 degrees as faherenheit

3 0
3 years ago
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vaieri [72.5K]

Answer:

notttaaa

Step-by-step explanation:

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PLEASE HELP MEEEEE!!!!!!!!!!!<br><br> Solve this quadratic equation.<br><br> x 2 + 5x + 3 = 0
andreev551 [17]

Answer:

x1=\frac{-5+\sqrt{13}}{2}\\ \\x2=\frac{-5-\sqrt{13}}{2}

Step-by-step explanation:

x² + 5x + 3 = 0

x = (- 5 +/- √5² - 4x1x3)/2x1

= (-5+/-√13)/2

x₁ = (- 5 + √13)/2

x² = (- 5 - √13)/2

3 0
3 years ago
What is 34 x 45 - 14x (5235+-42) / 24x
Musya8 [376]

Answer:

3(2040x-4039)/4x

Step-by-step explanation:

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