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71% (01:22) correct
29%
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A marketing company tested six different ovens to determine which oven cooked a baguette the fastest. The cooking times for the first three ovens were a minutes, b minutes, and c minutes, respectively. These three cooking times produced a standard deviation of d minutes. Was the standard deviation of the cooking times of the next three ovens greater than d minutes?
(1) The mean cooking time for the last three ovens was equal to the mean cooking time for the first three ovens.
(2) The cooking times for the last three ovens was equal to a + x, b + x, and c + x minutes, respectively.
(1) The mean cooking time for the last three ovens was equal to the mean cooking time for the first three ovens.
(2) The cooking times for the last three ovens was equal to a + x, b + x, and c + x minutes, respectively.
20 Nov 2024, 05:05
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to me c,
1) same avg doesn't mean same standard deviation, insufficent
2) is x positif, negatif? insufficent
both, x=0 so, same time of cooking respectively, same standard deviation, sufficent
1) same avg doesn't mean same standard deviation, insufficent
2) is x positif, negatif? insufficent
both, x=0 so, same time of cooking respectively, same standard deviation, sufficent
