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RSB [31]
3 years ago
9

I’m not sure Wht to do?

Mathematics
1 answer:
Leto [7]3 years ago
3 0
What was the question so I can help
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A community college has a math placement exam that has a mean of 65 and a standard deviation of 8.2. If a student takes the exam
Marat540 [252]

Answer:

The score that cuts off the bottom 2.5% is 48.93.

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 = 65, \sigma = 8.2

What is the score that cuts off the bottom 2.5%

This is X when Z has a pvalue of 0.025, so X when Z = -1.96.

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

-1.96 = \frac{X - 65}{8.2}

X - 65 = -1.96*8.2

X = 48.93

The score that cuts off the bottom 2.5% is 48.93.

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3 years ago
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sam's music teacher told him to practice his trombone for X amount of hours. he spent X amount of hours practicing did he practi
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Yes if he practices X amount of hours and is told to practice X amount of hours than he practiced long enough
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There are 8 tennis balls in a bag. Five of
MrRa [10]

Answer:

3/8 or a a decimal 0.375

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What is 3 to the 4th power in standard form
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Answer:

81, i think.

Step-by-step explanation:

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