Problem

In a normal distribution where $\mu=180$ and $\sigma=36$, what value of the random variable $x$ has $98.3 \%$ of the area to its right?

Solution

Step 1 :The problem is asking for the value of \(x\) such that the area to the right of \(x\) under the normal distribution curve is 98.3%. This is equivalent to finding the 1.7% percentile point (since 100% - 98.3% = 1.7%) of the normal distribution with mean \(\mu = 180\) and standard deviation \(\sigma = 36\).

Step 2 :The percentile point can be found using the inverse of the cumulative distribution function (CDF), also known as the quantile function.

Step 3 :By calculating, we get \(x = 103.67741916928256\)

Step 4 :This means that approximately 98.3% of the area under the normal distribution curve is to the right of this value.

Step 5 :Final Answer: The value of the random variable \(x\) that has 98.3% of the area to its right in a normal distribution where \(\mu=180\) and \(\sigma=36\) is approximately \(\boxed{103.68}\).

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Source: https://solvelyapp.com/problems/17620/

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