You can solve this one by adding their rates, but you have to invert the numbers they give you to find the rate. Rate is measured in something per unit of time, and "per" indicates division. So the rates are: 1/3 of an hour (Sally) and 1/6 of an hour (Steve). So add the rates: 1/3 + 1/6 = 1/2. (1/3 is 2/6, and 2/6 + 1/6 = 3/6). Since their combined rate is 1/2 of a room in one hour, it takes them two hours to paint the room.
This answer makes sense: It takes Sally three hours by herself; with Steve's help, she's faster, but not THAT much faster, because he's pretty slow. You can often spot-check word problem answers like this by giving it a common sense once-over. If we came up with four hours, that would clearly be wrong: it should take her LONGER if she's getting help.
The number of throws that the player make X follows binomial distribution.
The probability that the player makes x throws out of eleven throws is
The probability that the player makes at most nine out of eleven free throws
is
Correct choice is (B).
Answer:
19251
Step-by-step explanation:
Answer:50 the picture is A= 3 3/4
Step-by-step explanation:
31+1=32 82-32=50
Answer:
b. Time spent studying
Step-by-step explanation:
From the answer, choices provided it can be said that the confounding variable in James' study would be the Time spent studying because it is directly affecting the other variables in the study. The more time spent studying means the less time that the individual has spent using a cell phone, while at the same time drastically increasing the likelihood of getting better grades. Therefore, directly changing the values of both of these variables.
