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If [tex]$x$[/tex] represents a number picked at random from the set [tex]$\{-3,-2,-1,0,1,2\}$[/tex], what is the probability that [tex][tex]$x$[/tex][/tex] will satisfy the inequality [tex]$4-3x\ \textless \ 6$[/tex]?

A. [tex]$\frac{1}{6}$[/tex]
B. [tex][tex]$\frac{1}{3}$[/tex][/tex]
C. [tex]$\frac{1}{2}$[/tex]
D. [tex]$\frac{2}{3}$[/tex]


Sagot :

To solve this problem, we need to determine the probability that a randomly chosen number from the set [tex]\(\{-3, -2, -1, 0, 1, 2\}\)[/tex] satisfies the inequality [tex]\(4 - 3x < 6\)[/tex].

1. Solve the Inequality:
[tex]\[ 4 - 3x < 6 \][/tex]
Subtract 4 from both sides:
[tex]\[ -3x < 2 \][/tex]
Divide both sides by -3 (and reverse the inequality since we are dividing by a negative number):
[tex]\[ x > -\frac{2}{3} \][/tex]

2. Identify the Valid Values:
We next check which numbers in the set [tex]\(\{-3, -2, -1, 0, 1, 2\}\)[/tex] are greater than [tex]\(-\frac{2}{3}\)[/tex]:
- -3: Not greater than [tex]\(-\frac{2}{3}\)[/tex]
- -2: Not greater than [tex]\(-\frac{2}{3}\)[/tex]
- -1: Not greater than [tex]\(-\frac{2}{3}\)[/tex]
- 0: Is greater than [tex]\(-\frac{2}{3}\)[/tex]
- 1: Is greater than [tex]\(-\frac{2}{3}\)[/tex]
- 2: Is greater than [tex]\(-\frac{2}{3}\)[/tex]

Therefore, the valid values from the set are [tex]\(\{0, 1, 2\}\)[/tex].

3. Calculate the Probability:
There are 3 numbers that meet the condition [tex]\(x > -\frac{2}{3}\)[/tex], and the total number of elements in the set is 6.

The probability [tex]\(P\)[/tex] is given by the ratio of the number of valid outcomes to the total number of outcomes:
[tex]\[ P = \frac{\text{Number of valid values}}{\text{Total number of values}} = \frac{3}{6} = \frac{1}{2} \][/tex]

Therefore, the probability that [tex]\(x\)[/tex] will satisfy the inequality [tex]\(4 - 3x < 6\)[/tex] when picked at random from the set [tex]\(\{-3, -2, -1, 0, 1, 2\}\)[/tex] is:
[tex]\[ \boxed{\frac{1}{2}} \][/tex]