1. Will the bars look similar if a different teacher’s data is considered instead of Zakir’s?
2. Will the bars look different if the data for all 7 days of the week is considered?
3. Some bars in the chart may also match people doing other kinds of work/activities. Can you think of any? Discuss.
- 1. Will the bars look similar if a different teacher’s data is considered instead of Zakir’s?
- 2. Will the bars look different if the data for all 7 days of the week is considered?
- 3. Some bars in the chart may also match people doing other kinds of work/activities. Can you think of any? Discuss.
Answer: 1. Roughly similar (teachers stand and move a lot), but not identical: it depends on the subject, number of classes, travel and habits. 2. Yes, probably: weekends usually have more lying down and sitting and less standing for working people and students; a patient’s bar may change little. 3. Raghu’s bar fits a waiter, shop assistant or traffic police; Julie’s fits a driver or office worker; Pavani’s fits anyone who is bedridden.
Step-by-step solution
Idea: A bar shows one person’s average Monday-to-Friday day. Change the person, the days or the job and the shares can change, but similar lifestyles give similar bars.
1. Will the bars look similar if a different teacher’s data is considered instead of Zakir’s?
- Broadly similar, since most teachers stand while teaching and move between classes. But not exactly the same: a teacher with fewer periods, a long commute, a lot of correction work or a PE class would have more sitting or more moving.1 mark
Roughly similar, but not identical
2. Will the bars look different if the data for all 7 days of the week is considered?
- Yes, for most people. On Saturday and Sunday there is no school or office for many, so they usually sleep longer and sit more (TV, phone, rest), or move more if they play or do housework. Averaging 7 days mixes these in. For Pavani, who is a patient, the bar may hardly change.1 mark
Yes for most people; little change for the patient
3. Some bars in the chart may also match people doing other kinds of work/activities. Can you think of any? Discuss.
- Raghu’s (mostly standing/moving): waiter, shop assistant, security guard, traffic police, construction worker, farmer. Julie’s (mostly sitting): office worker, driver, tailor, cashier, call-centre worker. Zakir’s: a shopkeeper or salesperson. Pavani’s (mostly lying down): someone recovering from surgery, or a very old person.1 mark
E.g. Raghu: waiter, traffic police; Julie: driver, tailor; Pavani: anyone bedridden
1. A different teacher’s bar would look roughly similar but not the same. 2. Including weekends would change most bars (more lying or sitting for many people), but hardly the patient’s. 3. Many jobs share these patterns: Raghu’s fits a waiter or traffic police officer, Julie’s a driver or office worker, Pavani’s anyone confined to bed.
Answer to write in the exam
1.
Teachers stand and move while teaching ⇒ similar pattern
Periods, travel, correction work differ ⇒ shares differ
∴ Similar, not identical
2.
Weekends: no school or office for many
More lying/sitting (or more moving for some)
∴ Bars change for most people; the patient’s bar may not
3.
Mostly moving (like Raghu): waiter, security guard, farmer
Mostly sitting (like Julie): driver, tailor, cashier
Mostly lying (like Pavani): a person recovering from illness
Common mistakes that cost marks
- Saying every teacher must have exactly Zakir’s bar. One person’s data is only an example.
- Forgetting that a 7-day average includes weekends, which differ from weekdays.
- Suggesting jobs that do not fit the bar’s pattern (for example, a runner for Julie’s bar).
How this can come in the exam
MCQ (1 mark)
A person’s bar shows: lying down 33%, sitting 17%, standing/moving 50%. Which job fits best?
- Software engineer
- Bus driver
- Waiter
- Patient in hospital
Show answer
(C) Waiter
Half the day standing or moving fits a waiter.
Try one yourself
A tailor works 9 hours sitting at the sewing machine, sleeps 8 hours and moves around for the rest. Find the shares of her day.
Show answer
Sitting 924 = 37.5%, lying 824 ≈ 33.3%, moving 724 ≈ 29.2%.
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