URGENT PLS HELP! bag contains 25 white marbles and 10 black marbles you pick one marble at random what is the probability that you pick a black marble

Acar dealership pays you 5% commission on your first $10,000 on car sales and 8% commission on the sale amount over $10,000 if you sold a $12,000 car how much is your commission

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

All per-unit concepts rely on ratios,meaning,to provide a type of measurement