A random sample of 15 of the 78 competitors at a middle school gymnastics competition are asked
their height
The data set lists the heights in inches 55, 57, 57, 58, 59, 59, 59, 59, 59, 61, 62, 62, 63, 64, 66
a. What is the mean height of the sample?
Please include your dimensions with the numerical answer.

60

Step-by-step explanation:

mean: you just add all 15 numbers then divide the number you get by 15.

55+57+57+58+59+59+59+59+59+61+62+62+63+64+66=900

900/15=60

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.