## A population has mean 187 and standard deviation 32. If a random sample of 64 observations is selected at random from this population, what

Question

A population has mean 187 and standard deviation 32. If a random sample of 64 observations is selected at random from this population, what is the probability that the sample average will be less than 182

in progress 0
1 month 2021-10-18T06:06:55+00:00 1 Answer 0 views 0

11.51% probability that the sample average will be less than 182

Step-by-step explanation:

To solve this question, we have to understand the normal probability distribution and the central limit theorem.

Normal probability distribution:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean and standard deviation , the zscore of a measure X is given by: The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit theorem:

The Central Limit Theorem estabilishes that, for a random variable X, with mean and standard deviation , a large sample size can be approximated to a normal distribution with mean and standard deviation In this problem, we have that: What is the probability that the sample average will be less than 182

This is the pvalue of Z when X = 182. So By the Central Limit Theorem    has a pvalue of 0.1151

11.51% probability that the sample average will be less than 182