8.13 Sample proportions (calculating and comparison)
Interactive practice questions
From a sample of $400$400 young workers in Seattle, $37$37 had amber eyes.
What is the sample proportion of amber eyes for young workers in Seattle?
A manufacturer of cement trucks checked some of the cement trucks being distributed for faults. On one day, $75$75 cement trucks were checked and $16$16 of these were found to have some kind of fault.
What was the sample proportion for faulty cement trucks?
At an electronics store, cameras are sold at prices ranging from $\$150$$150 to $\$630$$630. On a particular day, there are $106$106 cameras on sale and $25$25 of these cost less than $\$260$$260.
If Irene came into the store and selected a camera at random, estimate the probability that camera would cost less than $\$260$$260.
A survey of $115$115 randomly selected people in Busan found that $6$6 of them were aged over $55$55.
A second survey of $2183$2183 randomly selected people in Busan found that $475$475 of them were aged over $55$55.