The histogram above shows information about the times, t minutes, patients spent at a doctor's surgery one day.
(a) calculate the percentage of patients who spent between 25 and 40 minutes at the surgery.
(b) 16 patients spent between 10 and 15 minutes at the surgery.
Calculate the total number of patients at the surgery that day.

I don't understand this question because it does not give the y axis, so how can I just use the x axis to find a percentage?

Question

contestada

Respuesta :

jimthompson5910 jimthompson5910 · Answer 1 · 2024-01-07T18:29:13+01:00

(a) 18%

(b) 200

===================================================

Explanation

Part (a)

Ideally your teacher should put numbers on the y axis, but we can make the reasonable assumption that each small tick mark represents 1%.

The bars have these heights

10, 10, 8, 35, 19, 6, 6, 6

Notice how those values add to 100 to represent 100% of the patients.

The "25 to 40 minute" subgroup is composed of the 6th, 7th, and 8th bars. Add up the heights for each: 6+6+6 = 18

Therefore, 18% of the patients spent between 25 and 40 minutes at the surgery.

-------------------------------------

Part (b)

The "10 to 15 minute" group is shown by the 3rd bar. This has a height of 8, so 8% of the patients waited somewhere in this timespan.

x = number of patients total

8% of x = 16 patients

0.08x = 16

x = 16/0.08

x = 200 patients total