Algebraic direct proportion 3 > Quiz 1 >
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The power, P (watts), of a car engine is proportional to the square of its speed, s (m/s).
When s = 35, P = 1580.
Work out the power (to 1 DP) when the speed is 30 m/s
P= 1
watts

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?