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Rzqust [24]
2 years ago
5

Which of the following statements about JK and JL is true?

Mathematics
1 answer:
mash [69]2 years ago
8 0

Answer:

B. JK is longer than JL

Step-by-step explanation:

JK is 6, JL is 5. Therefore, JK is longer than JL.

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A professor gives her 100 students an exam; scores are normally distributed. The section has an average exam score of 80 with a
frozen [14]

Answer:

6.18% of the class has an exam score of A- or higher.

Step-by-step explanation:

When the distribution is normal, we use 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 question, we have that:

\mu = 80, \sigma = 6.5

What percentage of the class has an exam score of A- or higher (defined as at least 90)?

This is 1 subtracted by the pvalue of Z when X = 90. So

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

Z = \frac{90 - 80}{6.5}

Z = 1.54

Z = 1.54 has a pvalue of 0.9382

1 - 0.9382 = 0.0618

6.18% of the class has an exam score of A- or higher.

4 0
3 years ago
You purchased 150 feet of chain that normally sells for $0.15 per inch. You were charged $22.50 for the sale. Was the price corr
icang [17]
No it was not correct because if there is 12 inches in one foot and you divid 150 by 12 you get 12.6. Then you would multiply 12.6 and .15 and you would get 20.40. So you were charged extra with out tax.
8 0
3 years ago
What is the midpoint of the segment shown below??
Leno4ka [110]

Answer:

c

Step-by-step explanation:

4 0
3 years ago
Which ratios are equivalent to 3:4
valentina_108 [34]
9:12, 18:24,6:8

3*3=9 and 4*3=12

3*6=18 and 4*6=24

3*2=6 and 4*2=8
6 0
3 years ago
Read 2 more answers
F (x)=2x-5 and g (x) =x+2 find (fog) (x)
zimovet [89]
2x-5=x+2
x=7

The answer is 7
5 0
3 years ago
Read 2 more answers
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