Professor jordan has suggested to his students that a strong relationship exists between the number of hours they spend studying and their grade on the final exam. he would like his students to improve their test scores by increasing the time they spend studying. the professor is describing a.
a. mean score.
b. negative correlation.
c. positive correlation.
d. standard deviation.

C. Positive correlation since he is telling the students of what they should do. It's not like if he is saying 'Study now! You students are dumb and get bad scores.' Mean scores are averages. Averages can be affected and could be the choice, but he says students, not class. So, C or A could fit.

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

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step-by-step explanation: