A student used a calculator to find the average of 30 numbers, and mistakenly input one of the data 108 into 18 What is the difference between the calculated average and the actual average?

A student used a calculator to find the average of 30 numbers, and mistakenly input one of the data 108 into 18 What is the difference between the calculated average and the actual average?

Let the sum of the first 29 numbers be a
Average = (a + 108) / 30
Average error = (a + 18) / 30
Right mean wrong mean = (a + 108) / 30 - (a + 18) / 30 = (108-18) / 30 = 3

An electronic computer can do 10 ^ 8 calculations per second. The number of calculations in ten minutes is ()

10^8*60*10
=600*10^8
=6*10^2*10^8
=6*10^10

An electronic computer can do 5 × 10 ^ 12 operations per second, and how many times can it work 3 × 10 ^ 2

I have already answered a similar question
5×10^12×3×10^2
=15×10^(12+2)
=15×10^14
=1.5×10^15

If - (b-2) is negative, then B-2 () 0

Greater than

Can a and B in a ^ 2 + B ^ 2 > = 2Ab be zero or negative? Can a and B in a + b > = 2 √ AB be zero or negative? Why?

a^2+b^2>=2ab
It holds for any number
So it can be either zero or negative
a+b>=2√ab
Not true for negative numbers

When a is a value, the solution of the equation 2b-a = 2 about B is positive, negative and 0

a> B is positive at - 2
When a = - 2, B is negative
a

If A.B is different sign and ABC > 0, then C is a.1 B.2 C.3 D nonnegative

D

-When | a | + | B | = 0, then a and B | = 0
The first two questions must be filled in brackets, not necessarily or definitely not, and the last two questions are all filled in brackets, not all or not all

-When | a | + | B | = 0, then a and B are zero

What is the smallest nonnegative number in a rational number?

The smallest nonnegative number of rational numbers is 0
Non negative numbers include zero and positive numbers
A positive number must be greater than 0
So the smallest nonnegative number of rational numbers is 0

What is the minimum nonnegative number
I'm waiting here!

Non negative numbers include positive integers and 0. The smallest positive integer is 1, and 1 is greater than 0, so the smallest non negative number is 0