Question

question 5: find the means of the follow numbers. (write answer as a decimal)
-2, 4, -1, 5
your answei
question 6: simplify (solve).
5 + 2(4 - 1) - (-1 + 3)
your answer

Explanation:

Question 5

Step1: Calculate the sum of the numbers

The sum of the numbers \(-2\), \(4\), \(-1\), and \(5\) is \((-2)+4+(-1)+5 = 6\).

Step2: Calculate the number of values

There are \(n = 4\) numbers.

Step3: Calculate the mean

The mean formula is \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\). Substituting the values, we get \(\bar{x}=\frac{6}{4}=1.5\).

Question 6

Step1: Simplify the expressions inside the parentheses

For \(4 - 1=3\) and \(-1 + 3 = 2\). The expression becomes \(5+2\times3-2\).

Step2: Perform the multiplication

According to the order of operations (PEMDAS), \(2\times3 = 6\). The expression is now \(5 + 6-2\).

Step3: Perform the addition and subtraction from left - to - right

\(5+6=11\), then \(11-2 = 9\).

Answer:

Question 5: \(1.5\)
Question 6: \(9\)