Question : The following table gives the number of patients visiting a dental clinic for issues related to their oral health during May, June, July, and August 2015. Study the table carefully and answer the question that follows.
| Month(2015) | Cleaning and polishing of teeth | Fixing crowns and bridging | Orthodontic treatment | Teeth whitening |
| May | 410 | 880 | 680 | 360 |
| June | 160 | 970 | 790 | 270 |
| July | 520 | 680 | 460 | 530 |
| August | 440 | 590 | 1020 | 280 |
For the given months in 2015, the average number of patients visiting the dental clinic for cleaning and polishing of teeth, fixing crowns and bridging, and teeth whitening is what percentage(rounded off to 1 decimal place) more/less than the average number of patients visiting the dental clinic for orthodontic treatment?
Option 1: More by 31.2%
Option 2: Less by 31.2%
Option 3: Less by 38.9%
Option 4: More by 38.9%
Correct Answer: Less by 31.2%
Solution :
The average number of patients for each treatment type over the given months:
1. Cleaning and polishing of teeth,
The total number of patients = 410 + 160 + 520 + 440 = 1530
The average = $\frac{1530}{4}$ = 382.5 patients
2. Fixing crowns and bridging,
The total number of patients = 880 + 970 + 680 + 590 = 3120
The average = $\frac{3120}{4}$ = 780 patients
3. Teeth whitening,
The total number of patients = 360 + 270 + 530 + 280 = 1440
The average = $\frac{1440}{4}$ = 360 patients
4. Orthodontic treatment:
The total number of patients = 680 + 790 + 460 + 1020 = 2950
The average = $\frac{2950}{4}$ = 737.5 patients
The average number of patients for cleaning and polishing of teeth, fixing crowns and bridging, and teeth whitening = $\frac{(382.5 + 780 + 360)}{3}$ = 507.5 patients
Percentage difference = $\left(\frac{507.5 - 737.5}{737.5}\right) \times 100 = -31.2$%
Hence, the correct answer is 'Less by 31.2%'.
Related Questions
Question : Calculate the mean from the following table.
| Scores | Frequencies |
| 0-10 | 2 |
| 10-20 | 4 |
| 20-30 | 12 |
| 30-40 | 21 |
| 40-50 | 6 |
| 50-60 | 3 |
| 60-70 | 2 |
Option 1: 33.4
Option 2: 32.6
Option 3: 35.8
Option 4: 34.2
Question : The following table shows the number of mobile phones sold by four different stores in four different years.
| stores | 2012 | 2013 | 2014 | 2015 |
| P | 178 | 183 | 205 | 225 |
| Q | 133 | 198 | 220 | 235 |
| R | 284 | 250 | 220 | 198 |
| S | 225 | 243 | 199 | 295 |
Find the difference between the number of mobile phones sold by store Q in 2013 and store S in 2015.
Option 1: 102
Option 2: 97
Option 3: 100
Option 4: 98
Question : The numbers of students who passed with different honours from a college from 2015 to 2018 are depicted in the given table. Study the table and answer the following question.
| Year | Mathematics | Physics | Chemistry | Zoology | Botany |
| 2015 | 10 | 5 | 8 | 7 | 5 |
| 2016 | 4 | 8 | 3 | 4 | 1 |
| 2017 | 15 | 10 | 8 | 5 | 3 |
| 2018 | 9 | 3 | 1 | 2 | 1 |
How many students passed Mathematics, Physics, Chemistry, Zoology, and Botany from the year 2015 to 2018?
Option 1: 112
Option 2: 97
Option 3: 100
Option 4: 99
Question : Study the following table carefully and answer the questions based on it.
The following table shows the domestic sales of vehicles of four manufacturers from 2010 to 2015.
The following table shows the domestic sales of vehicles of four manufacturers from 2010 to 2015.
| Manufacturer | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| A | 560000 | 580000 | 600000 | 620000 | 650000 | 680000 |
| B | 540000 | 590000 | 570000 | 630000 | 710000 | 550000 |
| C | 610000 | 580000 | 620000 | 680000 | 690000 | 630000 |
| D | 630000 | 570000 | 700000 | 690000 | 700000 | 640000 |
Concerning which of the following combinations, is the sales of vehicles lowest over the given period?
Option 1: A, 2010
Option 2: B, 2015
Option 3: B, 2010
Option 4: A, 2011
Question : Direction: The table given below shows the production (in 1000 tonnes) of five companies from 2012 to 2016.
| Years | |||||
| Company | 2012 | 2013 | 2014 | 2015 | 2016 |
| P | 302 | 386 | 412 | 503 | 470 |
| Q | 376 | 402 | 444 | 529 | 501 |
| R | 250 | 268 | 302 | 298 | 276 |
| S | 350 | 360 | 372 | 398 | 362 |
| T | 403 | 450 | 504 | 597 | 602 |
The production of all companies in 2014 is how much percent less than the production of all companies in 2015?
Option 1: 8.25
Option 2: 11.3
Option 3: 14.4
Option 4: 12.5
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