alexmarche4675
27.05.2020 •
Mathematics
In a recent experiment conducted by the Department of Energy, light bulbs were tested to measure how long they lasted. Each company submitted 20 2020 light bulbs, which were turned on and left on until they burned out. Here were the results: All 20 2020 "Super Bright" light bulbs burned out after exactly 1 , 500 1,5001, comma, 500 hours. The first "Delightful Bright" light bulb burned out after 1 , 200 1,2001, comma, 200 hours, and one additional bulb burned out every 50 5050 hours until they were all burned out. One of the "Pretty Bright" light bulbs burned out after just 16 1616 hours. The other 19 1919 bulbs lasted between 1 , 900 1,9001, comma, 900 and 2 , 000 2,0002, comma, 000 hours. Which of the following is true? Choose all answers that apply: Choose all answers that apply: (Choice A) A Super Bright light bulbs have the smallest standard deviation for light bulb life among the three types of bulbs. (Choice B) B The interquartile range of light bulb life for Delightful Bright is greater than the interquartile range for Pretty Bright. (Choice C) C The distribution of Delightful Bright light bulb life is skewed right. (Choice D) D Super Bright and Pretty Bright light bulbs cannot possibly have the same mean light bulb life.
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