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allsm [11]
3 years ago
8

The times to pop a 3.4-ounce bag of microwave popcorn without burning it are Normally distributed with a mean

Mathematics
1 answer:
NeTakaya3 years ago
4 0

This question is solved using the central limit theorem, giving an answer of:

Fourth option, approximately normal with mean of 140 seconds and standard deviation of 10 seconds.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean of 140, standard deviation of 20, sample of 4:

By the Central Limit Theorem, the distribution is approximately normal.

Mean is the same, of 140.

n = 4, \sigma = 20, thus:

s = \frac{\sigma}{\sqrt{n}} = \frac{20}{\sqrt{4}} = 10

Thus, the correct answer is:

Fourth option, approximately normal with mean of 140 seconds and standard deviation of 10 seconds.

For another example of the Central Limit Theorem, you can check brainly.com/question/15519207

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