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QOTD#16 Average temperature of city X (highs and lows)

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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1650 [0], given: 396

CAT Tests
QOTD#16 Average temperature of city X (highs and lows) [#permalink] New post 30 Nov 2016, 16:03
Expert's post
00:00

Question Stats:

100% (04:01) correct 0% (00:00) wrong based on 2 sessions
ImageImage


Question 7 During how many of the months in which City Y’s average rainfall exceeded 3 inches was City X’s average low temperature greater than or equal to 30 degrees?
A. One
B. Two
C. Three
D. Four
E. All

[Reveal] Spoiler: OA
B


Question 8 The “monthly midpoint” is calculated by taking the average (arithmetic mean) of a month’s average high and low. Which of the following is the average monthly midpoint in City X for the 3-month period from July to September?
A. 55.3
B. 60.0
C. 64.7
D. 69.3
E. 74.0

[Reveal] Spoiler: OA
C



Drill 2
Question: 7, 8
Page: 463


[Reveal] Spoiler: Img
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Sandy
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1 KUDOS received
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1650 [1] , given: 396

CAT Tests
Re: QOTD#16 Average temperature of city X (highs and lows) [#permalink] New post 30 Nov 2016, 16:08
1
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Expert's post
Explanation

Question 7. First, look on the bar chart to figure out which months had an average rainfall greater than 3 inches and then apply that information to the temperature chart. According to the bar chart, the only months that had an average rainfall exceeding 3 inches were January, February, March, October, November, and December. According to the line chart, only two of those months had average lows exceeding 30 degrees: October and November.
Hence option B is correct.

Question 8. This is a multi-step problem, so you should take it one step at a time. First, determine the monthly midpoint for each month. The high in July is 78, and the low is 59, so the monthly midpoint is: 78 + 59 = 137 ÷ 2 = 68.5. Similarly, the midpoint for August is: 76 + 57 = 133 ÷ 2 = 66.5. September’s midpoint is: 68 + 50 = 118 ÷2 = 59. The average of the three midpoints is: 59 + 66.5 + 68.5 = 194 ÷ 3 = 64.7, choice (C).

Hence option C is correct.
_________________

Sandy
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QOTD#16 Average temperature of city X (highs and lows)

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