120 The stem and leaf diagram shows the ages of people in a cinema.
2 1 3
Key: 2|1 represents 21 years
3 0 2 2 5
4 3 4 6 8 9 9
5 0 2 2 3 5
a) What is the range of ages? 34
years
b) How many people are represented in the diagram?
people
c) What is the median age?
years old
ET

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”?

Find the amplitude of a sinusoidal function that models this temperature variation

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