Question

irene’s grocery bills for two years (24 months) had a standard deviation of $15. if the lowest bill was $100 and the highest was $140, what is the range of her grocery bills? options: $40, $30, $35, $45

Explanation:

Step1: Recall the formula for range

The range of a set of data is calculated as the difference between the highest value and the lowest value. The formula is \( \text{Range} = \text{Highest Value} - \text{Lowest Value} \).

Step2: Identify the highest and lowest values

From the problem, the lowest bill is \( \$100 \) and the highest bill is \( \$140 \).

Step3: Calculate the range

Substitute the values into the formula: \( \text{Range} = 140 - 100 \).
\( 140 - 100 = 40 \)

Answer:

\$40