Answer:
A. 6.5
Step-by-step explanation:
First we find the average
of the 9 data:

Where n is the data number, that in this case is 9.

The formula of the standard deviation
is:

We replace the data and find the value of the standard deviation:


We approximate the number and the solution is 6,5
Answer:
7/12
Step-by-step explanation:
There are 12 disks total and 5 of them are red. so 12-5 is 7.
Answer:
Step-by-step explanation:
200ft (1mile/5,280ft) 60ft/1hr 200×60/5,280 = 2.27272727273
and round it to the2 decimal is 2.27
Answer:
5n - 4
Step-by-step explanation:
<u>Step 1: Convert words into an expression</u>
Four less than 5 times a number
5n - 4
Answer: 5n - 4