Answer:
1. x - 1
2. 
Step-by-step explanation:


2i+5=1250. You subtract 5 from 1250 then divide 2 from whatever you get from the 5-1250
I think it’s even because if you flip one of them they will equal up on the same line. it’s basically the inverse of the other one so it’s even
Answer:
27.5
Step-by-step explanation:
Answer:


Step-by-step explanation:
For this case we have the following data given:
2.3 3.1 2.8
1.7 0.9 4.0
2.1 1.2 3.6
0.2 2.4 3.2
Since the data are assumedn normally distributed we can find the standard deviation with the following formula:

And we need to find the mean first with the following formula:

And replacing we got:

And then we can calculate the deviation and we got:
