Example 1: Alena knows that her morning cup of coffee is a discretionary expense. She pays $2.75 for a 9-oz cup and was wondering if that is a typical price. On Monday, she asked 6 of her friends what they paid for a 9 oz cup of coffee. Their costs per cup were $2.85, $2.15, $1.95, $3.00, $2.05 and $2.40 SIGMA NOTATION Example 2: Use the information on page 6 of your text to examine the list of coffee prices in Example 1 (above). Find the mean using sigma notation.

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MrRoyal MrRoyal · Answer 1 · 2022-08-17T00:14:48+02:00

The mean using sigma notation is $2.4

The list of costs per cup are given as:

$2.85, $2.15, $1.95, $3.00, $2.05 and $2.40

The mean using sigma notation is calculated as:

[tex]\bar x = \frac{\sum x}{n}[/tex]

This gives

[tex]\bar x[/tex] = ($2.85 + $2.15 + $1.95 + $3.00 + $2.05 + $2.40)/6

Evaluate the sum

[tex]\bar x[/tex] = $14.4/6

Evaluate the quotient

[tex]\bar x[/tex] = $2.4

Hence, the mean using sigma notation is $2.4