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Georgia [21]
3 years ago
6

Please please please help me

Mathematics
1 answer:
zzz [600]3 years ago
6 0

Answer:

Step-by-step explanation:

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You interview 913 persons and only 5 prefer Cajun food. What percentage prefer Cajun food?
noname [10]
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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.

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3 years ago
On a local sports​ team, 20​% of 50 players are left​-handed. How many left​-handed players are​ there?
Novay_Z [31]

Answer:

10

Step-by-step explanation:

20%x50=10

5 0
3 years ago
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