Standard error (SE)

Or

Therefore, SE of the mean = (8)/(2) =4
No. If it has three sides, then it's a triangle, and not a trapezoid.
Answer: 1.6, but if your looking for rounding numbers, its 2. I suggest 1.6 though.
Step-by-step explanation: hope this helps :)
For a;

For b;

If my calculations are incorrect, then sorry ;/
- <u><em>❤ 7272033Alt ❤</em></u>
The 65 tens blocks can be solved by doing 65x10 which is 650. the 7 ones blocks can be solved by 1x7 which is 7 so you then add up 650 and 7 to get a grand total of 657