 # A population of values has a normal distribution with \mu=197 and \sigma=68. You intend waigaK 2020-11-22 Answered

A population of values has a normal distribution with $\mu =197$ and $\sigma =68$. You intend to draw a random sample of size $n=181$
Find the probability that a single randomly selected value is between 198.5 and 205.6.
$P\left(198.5?

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Step 1
From the provided information,
Mean $\left(\mu \right)=197$
Standard deviation $\left(\sigma \right)=68$
Let X be a random variable which represents the value.
$X\sim N\left(197,68\right)$
Step 2
The required probability that a single randomly selected value is between 198.5 and 205.6 can be obtained as:
$P\left(198.5
$=P\left(0.022
$=P\left(Z<0.126\right)-P\left(Z<0.022\right)$
$=0.5501-0.5088=0.0413$ (Using standard normal table)
Thus, the required probability is 0.0413.