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# Frequency tables

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1.
x Freq Probability P(x) xP(x) (x-µ )sqP(x)
9 3604
10 3131
11 2749
12 2488

Total µ= sigma sq=

Determine the probability distribution of the randum varible x.
What is the probability taht a randomly selected student is either in the 9th or 10th grade?
What is the probability that a randomly selected student is in at most 11th grade?
Find the mean and standard deviation of the random variable x.

##### Solution Summary

x Freq Probability P(x) xP(x) (x-µ )sqP(x)
9 3604
10 3131
11 2749
12 2488

Total µ= sigma sq=

Determine the probability distribution of the randum varible x.
What is the probability taht a randomly selected student is either in the 9th or 10th grade?
What is the probability that a randomly selected student is in at most 11th grade?
Find the mean and standard deviation of the random variable x.

##### Solution Preview

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<br>Determine the probability distribution of the random varible x.
<br>
<br>Total number of students = 11972
<br>P(x=9 ) = 3604/11972 = 0.30
<br>
<br>P(x=10) = 3131/11972 = 0.26
<br>
<br>P(x=11) = 2749/11972 = ...

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.