High School

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Suppose the amount of a popular sport drink in bottles leaving the filling machine has a normal distribution with a mean of 100.5 milliliters (mL) and a standard deviation of 1.5 mL. If 35 bottles are randomly selected, find the probability that the mean content is less than 102.1 mL.

Answer :

Apply z-score

Given data

[tex]\begin{gathered} \operatorname{mean}\text{ }\mu\text{ = 100.5} \\ \text{Standard deviation }\sigma\text{ = 1.5} \\ x\text{ = 102.1} \end{gathered}[/tex]

Here, we use the normal distribution formula below to calculate the answer.

[tex]\begin{gathered} z\text{ = }\frac{x\text{ - }\mu}{\sigma} \\ \text{Next, substitute the values of }\sigma,\text{ }\mu\text{ and x.} \end{gathered}[/tex][tex]\begin{gathered} z\text{ = }\frac{102.1\text{ - 100.5}}{1.5} \\ z\text{ = }\frac{1.6}{1.5} \\ z\text{ = 1.067} \end{gathered}[/tex]

Next, use the normal distribution table to find probability.

From the normal distribution table,

The probability that the mean content is less than 102.1 mL = 0.3554

Final answer = 0.3554

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