Answer:
3(x-4)
Step-by-step explanation:
3×4=12 and 3 also goes into 3x
If two chords intersect each other inside a circle, the products of their segments are equal.
3n = 6*4
3n = 24
n = 24/3
n = 8
1) Mean
The mean is given by the sum of the data divided by the number of data (4, in this case):

2) Standard deviation
The standard deviation is given by:

where

is the mean, that we already found at point 1), and N=4. Substituting data, we have:

Answer:
headband 17.88
Wristband 9.31
Step-by-step explanation:
headband: 822.48/(43+3)
Wristband: 400.33/43