Question

brad 15.1
mildred 12.8
katie 17.4
jimmy —
mean value —
the last measurement travis needs to make is of jimmy’s shoe print, which is below.
image of shoe print and ruler
the length that travis should enter into the table for jimmy’s shoe print is ____, and the mean value of travis’ measurements is ____.
a. 17.0; 15.1
b. 6.3; 14.4
c. 17.0; 15.6

Explanation:

Step1: Measure Jimmy's shoe print

Looking at the ruler, the shoe print starts around 0 cm (or 0 inches, but the scale here seems to have cm on top and inches below). Wait, the left end of the shoe print (the first part) and the right end. Wait, the right shoe print's end is at 17.0 cm? Wait, no, maybe I misread. Wait, the ruler has cm from 0 to 19. Wait, the left shoe part: no, the two shoe prints? Wait, no, the problem is about Jimmy's shoe print length. Wait, the ruler: the leftmost part of the shoe (the first dark shape) and the rightmost part. Wait, looking at the ruler, the left end is at 0 cm? No, maybe the left shoe's left end is at, say, 0, and the right shoe's right end is at 17.0 cm? Wait, no, maybe the length is from the start to the end. Wait, the ruler's top scale is cm. Let's see: the left shoe (the C-shaped one) and the right shoe. Wait, maybe the length of Jimmy's shoe print is 17.0 cm? Wait, no, maybe the inches? Wait, the bottom scale is inches. Wait, 6.3 inches? No, the options have 17.0 and 6.3. Wait, let's check the first part: Brad is 15.1, Mildred 12.8, Katie 17.4. So the units are probably cm. So Jimmy's shoe print: looking at the ruler, the right end is at 17.0 cm? Wait, no, maybe the left end is at 0, and the right end at 17.0. So Jimmy's length is 17.0.

Step2: Calculate the mean

Now, the measurements are Brad:15.1, Mildred:12.8, Katie:17.4, Jimmy:17.0. Wait, no, wait: the table has Brad, Mildred, Katie, Jimmy (empty), mean (empty). So first, find Jimmy's length: from the ruler, the shoe print's length. Let's see the ruler: the left end is at 0 cm (or maybe the left shoe's left is at 0, and the right shoe's right is at 17.0 cm? Wait, the ruler's top is cm, so the right end of the shoe is at 17.0 cm. So Jimmy's length is 17.0.

Now, calculate the mean: sum of all four measurements (Brad, Mildred, Katie, Jimmy) divided by 4.

Sum = 15.1 + 12.8 + 17.4 + 17.0. Let's calculate:

15.1 + 12.8 = 27.9

27.9 + 17.4 = 45.3

45.3 + 17.0 = 62.3

Wait, no, that can't be. Wait, maybe I made a mistake. Wait, the options: option C is 17.0; 15.6. Let's recalculate:

Wait, maybe Jimmy's length is 17.0, and the mean is (15.1 + 12.8 + 17.4 + 17.0)/4.

15.1 + 12.8 = 27.9

27.9 + 17.4 = 45.3

45.3 + 17.0 = 62.3

62.3 / 4 = 15.575, which rounds to 15.6. Ah, that matches option C.

Wait, but let's check the ruler again. Maybe the length is 17.0 cm. So Jimmy's length is 17.0. Then mean is (15.1 + 12.8 + 17.4 + 17.0)/4 = (15.1 + 12.8 = 27.9; 27.9 + 17.4 = 45.3; 45.3 + 17.0 = 62.3; 62.3 / 4 = 15.575 ≈ 15.6). So the correct option is C.

Answer:

C. 17.0; 15.6