The graph below illustrates the time students took to complete a test when all students were allowed to finish. The distribution has mean 65 minutes and standard deviation 10 minutes. Using the Empirical Rule, if the instructor sets a time limit of 75 minutes, at least % of students should be able to finish because this is one standard deviation above the mean.

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step-by-step explanation:

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign

there are infinitely many solutions.

45.36 feet per second.

step-by-step explanation:

to find the most accurate determination for the number of feet per second tyrone traveled on his way to work let us convert miles to feet and minutes to seconds.

1 mile = 5280 feet.

1 minute = 60 seconds.

now we will divide 158400 by 3492 to find the most accurate determination for the number of feet per second tyrone traveled on his way to work.

therefore, tyrone traveled on his way to work at the rate of 45.36 feet per second.