## An apple juice producer buys all his apples from a conglomerate of apple growers in one northwestern state. The amount of juice obtained fro

Question

An apple juice producer buys all his apples from a conglomerate of apple growers in one northwestern state. The amount of juice obtained from each of these apples is approximately normally distributed with a mean of 2.25 ounces and a standard deviation of 0.15 ounce. 77 percent of the apples will contain at least how many ounces of juice?

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2022-01-08T07:18:07+00:00
2022-01-08T07:18:07+00:00 1 Answer
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## Answers ( )

Answer:So the value of height that separates the bottom 23% of data from the top 77% is 2.139.

So we can conclude that 77% of the apples will contain at least 2.139 ounces

Step-by-step explanation:Previous concepts

Normal distribution, is a “probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean”.The

Z-scoreis “a numerical measurement used in statistics of a value’s relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean”.Solution to the problemLet X the random variable that represent the heights of a population, and for this case we know the distribution for X is given by:

Where and

The z score formula is given by:

For this part we want to find a value a, such that we satisfy this condition:

(a)

(b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.

As we can see on the figure attached the z value that satisfy the condition with 0.23 of the area on the left and 0.77 of the area on the right it’s z=-0.739. On this case P(Z<-0.739)=0.23 and P(z>-0.739)=0.7

7

If we use condition (b) from previous we have this:

But we know which value of z satisfy the previous equation so then we can do this:

And if we solve for a we got

So the value of height that separates the bottom 23% of data from the top 77% is 2.139.

So we can conclude that 77% of the apples will contain at least 2.139 ounces