This box plot shows information about the marks scored in a test.

see explanation

Step-by-step explanation:

(a)

The median is represented by the solid vertical line inside the box, that is

median = 58

(b)

The interquartile range is the difference between the upper and lower quartiles.

The upper quartile is the value on the right side of the box, that is 72

The lower quartile is the value on the left side of the box, that is 34

Interquartile range = 72 - 34 = 38

(c)

The range is the difference between the maximum and minimum values

The maximum is indicated by the vertical bar on the right outside the box

The minimum is indicated by the vertical bar on the left outside the box

Range = 86 - 10 = 76

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.