Step-by-step explanation:
Mean=sum of observations/no. of observations
They added it wrong. They added it like this:

When it shouldve been this:

They just added a place marker in all numbers below 100.
Answer: 5
Step-by-step explanation: This is the equation
12^2 + x^2 = 13^2
You solve for x
Answer:
66.7%
Step-by-step explanation:
The numbers less than 7 on the list are 3, 4, 5, and 6.
4 numbers are less than 7 out of total 6 numbers.
4/6 = 2/3 = 0.667 = 66.7%