Mike works part time at a grocery store. he also mows lawns to earn some extra money. he earns $9.50 per hour at the grocery store and $12 per hour for mowing lawns. he worked for a total of 49 hours last week

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.

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

What is the ratio of the length of an object in yards to the length of the same object in miles?