Submarine must descend by 12 feet in the fifth minute.
Average of the data:
- Average of a data set is calculated by dividing the sum of terms by the number of the terms of the set.
From the table given in picture,
Let the distance descended by submarine in 5th minute = x feet
Average distance descended by the submarine = [tex]\frac{\text{Total distance distended}}{\text{Duration or time}}[/tex]
= [tex]\frac{8+10+8+12+x}{5}[/tex]
= [tex]\frac{38+x}{5}[/tex] feet per minute
Statement given in the question → "Submarine must descend at an average rate of at least 10 feet per minute"
So the inequality for the statement will be,
[tex]\frac{38+x}{5}\geq 10[/tex]
38 + x ≥ 50
x ≥ 50 - 38
x ≥ 12
Therefore, submarine must descend 12 feet in the 5th minute.
Learn more about the average here,
https://brainly.com/question/14194794?referrer=searchResults
