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60%, 4

1. The graph is labeled with "days before follow-up call," then it represents data collected before the follow-up calls took place. To find the number of referrals made by students who received a "follow-up call 5 days after signing up", we should look for the bar that represents "5 days before follow-up call" because it reflects data collected 5 days into the students' enrolment, which is the same as receiving a "follow-up call 5 days after signing up."

Now let us take a look at bar 1 and bar 5,
40 x y% = 24, y = 60%

2. We are asked at least 25 referrals, which tells us referrals >= 25. Bar 4,3,2,1 satisfy this condition.
Answer 4 days
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Part 1: The number of referrals made by students who received a follow-up call 5 days after signing up at the school is closest to ____________ % of the number of referrals made by students who received a follow-up call 1 day after signing up at the school.

The number of referrals made by students who received a follow-up call 5 days after signing up at the school = 24

The number of referrals made by students who received a follow-up call 1 day after signing up at the school = 40

We need to figure out: 24 is WHAT % of 40?
i.e 24 = (x/100)*40

Solving for x we get 60%.

Part 2: Based on the information shown in the graph, if the school wishes to receive at least 25 referrals in a 1-year period, it should make follow-up calls no later than ____________ day(s) after students sign up at the school.

Looking at the bar corresponding to 4 days after singing up and 5 days after singing up, we see that number of referrals in 4 days after singing up = 26 and number of referrals in 5 days after singing up = 24.

Therefore, If the the school wishes to receive at least 25 referrals in a 1-year period, it should make follow-up calls no later than 4 day(s) after students sign up at the school.
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Q1) The number of referrals made by students who received a follow-up call 5 days after signing up at the school is 25, which is 500% of the number of referrals made by students who received a follow-up call 1 day after signing up at the school (5). So the answer is 60%.

Q2) To receive at least 25 referrals, the school should make follow-up calls no later than 4 days after students sign up at the school, because 25 is the number of referrals made by students who received a follow-up call 5 days after signing up. So the answer is 4.

Q3) The relationship between the number of days before the follow-up call and the number of referrals is **positive**. This is because the number of referrals increases as the number of days before the follow-up call increases. For example, students who received a follow-up call 5 days after signing up made 25 referrals, while students who received a follow-up call 8 days after signing up made 40 referrals. So the answer is C (Positive)
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Official Explanation

The answer to the first question is C. The number of referrals made by students who received a follow-up call 1 day after signing up at the school is 40. The number of referrals made by students who received a follow-up call 5 days after signing up at the school is approximately 24, which is closest to 60% of 40.

Answer: C

The answer to the second question is A. If the school wishes to receive at least 25 referrals in a 1-year period, it should make follow-up calls no later than 4 days after students sign up at the school. If the company waits 5 days or longer, it is likely to receive fewer than 25 student referrals per year.

Answer: A

Additional Question

The relationship between the number of days before the follow-up call and the number of referrals is negative. As the number of days before the follow-up call increases, the number of referrals decreases.

Answer: B
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