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20 Jun 2016, 11:09
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B
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84% (00:28) correct
16%
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What is the standard deviation of the values of the 20 coins in a certain jar ?
(1) The average (arithmetic mean ) value of the coins in the jar is 25 cents .
(2) All 20 coins in the jar have the same value .
(1) The average (arithmetic mean ) value of the coins in the jar is 25 cents .
(2) All 20 coins in the jar have the same value .
21 Jun 2016, 10:57
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Skywalker18
What is the standard deviation of the values of the 20 coins in a certain jar ?
1. The average (arithmetic mean ) value of the coins in the jar is 25 cents .
2. All 20 coins in the jar have the same value .
1. The average (arithmetic mean ) value of the coins in the jar is 25 cents .
2. All 20 coins in the jar have the same value .
1. The average (arithmetic mean ) value of the coins in the jar is 25 cents . We don't know other values to find out standard deviation. Not Sufficient.
2. All 20 coins in the jar have the same value . All the values are same means SD is 0. Sufficient
B is the answer
19 Jan 2018, 09:00
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Skywalker18
What is the standard deviation of the values of the 20 coins in a certain jar ?
1. The average (arithmetic mean ) value of the coins in the jar is 25 cents .
2. All 20 coins in the jar have the same value .
1. The average (arithmetic mean ) value of the coins in the jar is 25 cents .
2. All 20 coins in the jar have the same value .
Target question: What is the standard deviation of the values of the 20 coins in a certain jar ?
Statement 1: The average (arithmetic mean ) value of the coins in the jar is 25 cents .
There are several cases that satisfy statement 1. Here are two:
Case a: All 20 coins are quarters (each is worth $0.25). This meets this condition that the average value is 25 cents. In this case, the standard deviation EQUALS 0
Case b: The 20 coins are NOT all quarters. In this case, the standard deviation does NOT equal 0
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: All 20 coins in the jar have the same value
The means the standard deviation EQUALS 0
Since we can answer the target question with certainty, statement 2 is SUFFICIENT
Answer: B
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