BIO How many times does a typical person blink her eyes in a lifetime?

Solution 21E Step 1 Here we would compute the number of times a person would compute blink his eyes in his lifetime. Consider that on average a person lives for 60 years. A human needs 6 hours of sleep every day. Thus on an average a human would keep his eyes open for 18 hours a day( One day is equal to 24 hours). Step 2 It has been known that a person blinks 15 to 20 times in a minute. Thus a blink last for 0.33 seconds. In a hour the person blinks around 1200 times number of blinks in a minute × number of minutes in a hour 20 × 60 minutes = 1200 Number of blinks in a day=Number of blinks in a hour × number of hours in a day 1200 × 18hours = 21600 That is 21600 times a day. Thus in a year the number of times a person would be equal to Number of blinks in a day × Number of days in a year 6 21600 × 365 = 7.884 × 10 times a year.