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# Find the mean and median of the values of the random variabl

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Find the mean and median of the values of the random variabl [#permalink]  30 May 2019, 10:30
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Find the mean and median of the values of the random variable X, whose relative frequency distribution is given in the table below.

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#GREexcercise Find the mean and median of the values.jpg [ 17.71 KiB | Viewed 7142 times ]

[Reveal] Spoiler: OA
mean=2.03, median=1

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Re: Find the mean and median of the values of the random variabl [#permalink]  16 Jun 2019, 20:22
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Re: Find the mean and median of the values of the random variabl [#permalink]  16 Jun 2019, 22:20
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almondspeeing wrote:

Here

A chart of relative frequency of the numbers are given, please be informed they are not the actual frequency. The total of the relative frequencies will always be 1 or 100%

So when it says that the relative frequency of 2 is 0.10, that means that 2 occurs ten percent of the time.

Hence to find out the mean, let's calculate

$$\frac{[(0*18)+(1*33)+(2*10)+(3*6)+(4*33)]}{100}= \frac{203}{100} = 2.03$$

B) As per the table,

When x = 0, the relative frequency = 0.18, i.e. 0 occurs 18% of the time and similarly 1 occurs 33% of time

so 18 + 33 = 51, we are in the middle range and hence median = 1

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