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Sagot :
Answer:
The value of the third reading is 80 F
[tex]x=80^0F[/tex]Explanation:
Let x represent the value of the third reading.
The average of a set of data equals the sum of all the data divided by the number of data;
[tex]\text{Average =}\frac{sum\text{ of data}}{\text{number of data}}[/tex]Given;
Average = 80 F
Sum of data = 65+85+x+90
Number of data = 4
substituting we have;
[tex]80=\frac{65+85+x+90}{4}[/tex]solving for x;
[tex]\begin{gathered} 80=\frac{65+85+x+90}{4} \\ 80\times4=65+85+x+90 \\ 320=65+85+x+90 \\ 320=240+x \\ 320-240=x \\ x=80 \end{gathered}[/tex]Therefore, The value of the third reading is 80 F
[tex]x=80^0F[/tex]
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