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Updated on: 19 Nov 2023, 06:53
Originally posted by Sajjad1994 on 13 Jan 2021, 09:00.
Last edited by BottomJee on 19 Nov 2023, 06:53, edited 2 times in total.
Last edited by BottomJee on 19 Nov 2023, 06:53, edited 2 times in total.
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Dropdown 1: February 17
Dropdown 2: 22%
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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63% (02:53) correct
37%
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From each drop-down menu, select the option that creates the most accurate statement based on the information provided.
1. The proportion of a day’s earthquakes that registered a 3 or higher on the Richter scale was greatest on .
2. Of the earthquakes shown, approximately occurred on February 14.
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Dropdown 1: February 17
Dropdown 2: 22%
rocky620
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14 Jan 2021, 06:13
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The proportion of a day’s earthquakes that registered a 3 or higher on the Richter scale was greatest on____________Of the earthquakes shown, approximately_____________occurred on February 14.
Kindly refer the image below:
As shown, the proportion if of earth quake that registered 3 or higher in Richter scale on the following dates is:
14-Feb = \(\frac{31}{179}\) ~ 17%
15-Feb = \(\frac{13}{132}\) ~ 10%
16-Feb = \(\frac{13}{141}\) ~ 9%
17-Feb = \(\frac{23}{115}\) ~ 20%
18-Feb = \(\frac{16}{115}\) ~ 14%
19-Feb = \(\frac{15}{110}\) ~ 14%
The greatest proportion was on 17-Feb
Total Earthquakes ~ 792, of which ~179 occurred on 14-Feb ~ 22.60% = 22%
First Blank
A. February 14
B. February 15
C. February 16
D. February 17
E. February 18
F. February 19
Second Blank
A. 17%
B. 22%
C. 27&
D. 32%
E. 37%
IMO Option D & Option B
Kindly refer the image below:
As shown, the proportion if of earth quake that registered 3 or higher in Richter scale on the following dates is:
14-Feb = \(\frac{31}{179}\) ~ 17%
15-Feb = \(\frac{13}{132}\) ~ 10%
16-Feb = \(\frac{13}{141}\) ~ 9%
17-Feb = \(\frac{23}{115}\) ~ 20%
18-Feb = \(\frac{16}{115}\) ~ 14%
19-Feb = \(\frac{15}{110}\) ~ 14%
The greatest proportion was on 17-Feb
Total Earthquakes ~ 792, of which ~179 occurred on 14-Feb ~ 22.60% = 22%
First Blank
A. February 14
B. February 15
C. February 16
D. February 17
E. February 18
F. February 19
Second Blank
A. 17%
B. 22%
C. 27&
D. 32%
E. 37%
IMO Option D & Option B
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Earth QUales.png [ 19.01 KiB | Viewed 8107 times ]
14 Jan 2021, 09:30
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Official Explanation
Statement 1: February 17. Beware of choosing February 14 just because it has the largest number of earthquakes registering 3 or greater—it also has the largest number of total earthquakes, so we’ll need to compute some actual proportions. Rather than calculate the proportion for each of the six days, start by eliminating days based on how they compare with other, similar days.
Start by looking for a day that has a high number of earthquakes rated 3+ but a low number of total earthquakes. February 17 fits the bill.
February 15, 16, and 18 all have a lower number of 3+ earthquakes but an equal or higher number of total earthquakes, so the proportion of earthquakes rates 3+ on these three days must be less than the proportion on February 17. Eliminate February 15, 16, and 18.
February 19 has a lower overall total but also a lower number of earthquakes rated 3+. The decline in the total is not as much as the decline in earthquakes rated 3+, so this day must also have a lower proportion than does February 17. (However, if you feel that this one is too close to eliminate up front, go ahead and calculate the actual proportion.)
Only February 14 and February 17 remain to be calculated. Find the number of 3+ quakes and divide by the total number or quakes. Note that each tick mark on the y-axis is equivalent to 10 quakes. Also, you can estimate a little.
Use your calculator to find the values
(# 3 or greater quakes that day) / (total # of quakes that day)
February 14 = 30/179 = 16.7%
February 17 = 20/114 = 17.5%
The proportion is higher on February 17.
Statement 2: 22%. The question stem tells you that you can approximate. Use the calculator to sum the daily totals: 180 + 130 + 140 + 115 + 115 + 110 = 790. Finally, 180 ÷ 790 = 22.8%.
Answer: D & B
Statement 1: February 17. Beware of choosing February 14 just because it has the largest number of earthquakes registering 3 or greater—it also has the largest number of total earthquakes, so we’ll need to compute some actual proportions. Rather than calculate the proportion for each of the six days, start by eliminating days based on how they compare with other, similar days.
Start by looking for a day that has a high number of earthquakes rated 3+ but a low number of total earthquakes. February 17 fits the bill.
February 15, 16, and 18 all have a lower number of 3+ earthquakes but an equal or higher number of total earthquakes, so the proportion of earthquakes rates 3+ on these three days must be less than the proportion on February 17. Eliminate February 15, 16, and 18.
February 19 has a lower overall total but also a lower number of earthquakes rated 3+. The decline in the total is not as much as the decline in earthquakes rated 3+, so this day must also have a lower proportion than does February 17. (However, if you feel that this one is too close to eliminate up front, go ahead and calculate the actual proportion.)
Only February 14 and February 17 remain to be calculated. Find the number of 3+ quakes and divide by the total number or quakes. Note that each tick mark on the y-axis is equivalent to 10 quakes. Also, you can estimate a little.
Use your calculator to find the values
(# 3 or greater quakes that day) / (total # of quakes that day)
February 14 = 30/179 = 16.7%
February 17 = 20/114 = 17.5%
The proportion is higher on February 17.
Statement 2: 22%. The question stem tells you that you can approximate. Use the calculator to sum the daily totals: 180 + 130 + 140 + 115 + 115 + 110 = 790. Finally, 180 ÷ 790 = 22.8%.
Answer: D & B
