Answer: 136
Step-by-step explanation:
According to the Empirical rule , If a data is normally distributed then about 68% of the population lies within one standard deviation from mean.
We suppose that the mean of a normally distributed population is 300, and 200 simple random samples are drawn from the population.
i.e. [tex]\mu=300[/tex]
Number of simple random samples : n= 200
By Empirical rule , about 68% of 200 samples’ confidence intervals we would expect to contain the population mean .
Required number of samples = 68% of 200
= 0.68 x 200 = 136
Hence , the required number of samples = 136
