a set of data whose histogram is bell shaped yields a mean and standard deviation of 50 and 4, respectively, approximately what proportion of observation

Abetween 46 and 54?

Verified Answer :

\(\mathbb P(46

The empirical rule says that approximately 68% of the data lies within one standard deviation of the mean.

The proportion of observation that lies between \(46\) and \(54\) is \(68\%\).

What is empirical rule ?

Empirical rule : In statistics, the \(68-95-99.7\) rule, also known as the empirical rule, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: \(68\%,\) of the values lie within one standard deviations of the mean.

i.e. \(\mu -\sigma\) and \(\mu+\sigma\)

We have,

Mean \((\mu)=50\)

Standard deviation \((\sigma)=50\)

So,

Now Using the Empirical rule,

\(\mu -\sigma\) and \(\mu+\sigma\)

i.e.

\(50-4=46\)

and, \(50+4=54\)

That means,

That data lie between  \(46\) and \(54\) is \(68\%\).

Hence, we can say that the proportion of observation that lies between \(46\) and \(54\) is \(68\%\).

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