Suppose an average person

Question

blinks 15 times per hour. How
many times does an average
person blink in a year? Write
the answer in scientific
notation (Hint: 1 year = 365
days, 1 day = 24 hours).
(1 point)
1.314 × 10
4
1.314 × 10
−4
1.314 × 10
−5
1.314 × 10
5

Answer 1

To calculate the number of times an average person blinks in a year, we follow these steps:

1. Determine how many blinks occur in one hour: 15 blinks/hour

2. Calculate how many hours are in a year:

   \[ \text{Hours in a year} = 365 \text{ days/year} \times 24 \text{ hours/day} = 8760 \text{ hours/year} \]

3. Now, multiply the number of blinks per hour by the total number of hours in a year:

   \[ \text{Total blinks in a year} = 15 \text{ blinks/hour} \times 8760 \text{ hours/year} \] \[ = 131400 \text{ blinks/year} \]

4. To express this in scientific notation:

   \[ 131400 = 1.314 \times 10^5 \]

Thus, the average person blinks approximately \(1.314 \times 10^5\) times in a year.

The correct answer is: 1.314 × 10^5.