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Health Activity Answers
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| Healthy Hearts | Comparing Calories
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More Math Concepts
Healthy Hearts
1.
Answers will vary. This question is intended to get
kids thinking and talking about how fast their hearts
beat and how many beats are in a billion.
2.
Answers will vary. A pulse can usually be found on the
side of the neck or on the underside of the wrist. This
activity works best if you watch the clock and tell
students when to start and stop while they count the
beats. If you do it for 10 seconds, students should
multiply the number of beats times 6 to figure the beats
per minute. If you do it for 15 seconds, students should
multiply the number of beats times 4 to figure the beats
per minute.
3.
Answers will vary. The average heart rate is around
70–80 beats per minute. To calculate this for 75 beats
per minute, take (75 beats per minute) x (60 minutes
per hour) x ( 24 hours per day) = 108,000 beats per
day.
4.
Answers will vary because of differing heart rates.
(1,000,000,000 beats) / (108,000 beats per day) is approximately
9259 days. (9259 days) / (365 days per year) = 25.37
years. Students’ answers should be around 25 years.
5.
Answers will vary. Students need to determine the number
of years and days they have been alive and use their
rates to calculate the number of heart beats.
6.
Answers will vary. Students need to calculate the number
of years they think they will live and use their rates
to calculate the number of heart beats.
7.
Answers will vary. If you are 16, the average heart
rate is 220-16=204.
8.
Answers will vary. Using the example above, the zone
is 50% of 204=102/75% of 204=153 or between 102 and
153.
9.
Answers will vary.
Comparing
Calories
1.
Calories range from 260 to 330.
2.
Calories range from 320 to 380.
3.
Adding up the calories for the 16 hamburger sandwiches
gives you 8170 calories. Divide 8170 by 16 to get an
average of 510 calories per sandwich. You can also enter
the data into a calculator and use the statistics functions
to calculate the average or mean.
4.
Adding up the calories for the 6 chicken sandwiches
gives you 3030 calories. Divide 3030 by 6 to get an
average of 505 calories per sandwich. You can also enter
the data into a calculator and use the statistics functions
to calculate the average or mean.
5.
The data 350,440,480,500,550, and 710 result in the
following box and whisker plot. This can be done by
hand or with the help of the graphing calculator. By
hand, have student arrange data in order from lowest
to highest. Since there are 6 pieces of data, the middle
value is between the middle two pieces of data, 480
and 500. So the middle bar is at 490. Since there are
three values to the left of the middle value the left
endpoint is at 350 and the left side of the box is at
the middle piece of data, or 440. Similarly, the right
side of the box is at 550, and the right endpoint is
710.
6.
There are 16 pieces of data, so 4 values are represented
in each section. The left end point is at 260, the left
side of the box is at 325, the middle bar is at 510,
the right side of the box is at 605, and the right end
point is at 960.
7.
The following graph shows chicken (on top) as compared
with hamburger sandwiches. Some things students notice
may include: their middle values or medians are very
close the right whisker for hamburgers is very long
because a couple of sandwiches have a lot of calories
and you can get a burger that has fewer calories than
chicken sandwiches.
8.
Answers will vary. Students can argue either way depending
on what part of the data they use. This is a good place
for class discussion.
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