Decide if each sample is random. Explain why or why not.
a. Asking every 15th person on the school roster if they buy lunch in the cafeteria or bring lunch from
home.
b. Measuring the height of all the sunflowers to find the mean height of all the flowers in a garden.

Can someone pls ! pls answer all. no explanation needed..

What term makes it inconsistent y=2x - 4 ?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?