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TKK Products Manufactures Electric Light Bulbs in the 50-, 60-

Question 231

Multiple Choice

TKK Products manufactures electric light bulbs in the 50-, 60-, 75-, and 100-watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 750 hr and a standard deviation of 60 hr. What is the probability that a TKK light bulb selected at random will burn between 750 and 870 hr?


A) TKK Products manufactures electric light bulbs in the 50-, 60-, 75-, and 100-watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 750 hr and a standard deviation of 60 hr. What is the probability that a TKK light bulb selected at random will burn between 750 and 870 hr? A) B) C) D) E)
B) TKK Products manufactures electric light bulbs in the 50-, 60-, 75-, and 100-watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 750 hr and a standard deviation of 60 hr. What is the probability that a TKK light bulb selected at random will burn between 750 and 870 hr? A) B) C) D) E)
C) TKK Products manufactures electric light bulbs in the 50-, 60-, 75-, and 100-watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 750 hr and a standard deviation of 60 hr. What is the probability that a TKK light bulb selected at random will burn between 750 and 870 hr? A) B) C) D) E)
D) TKK Products manufactures electric light bulbs in the 50-, 60-, 75-, and 100-watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 750 hr and a standard deviation of 60 hr. What is the probability that a TKK light bulb selected at random will burn between 750 and 870 hr? A) B) C) D) E)
E) TKK Products manufactures electric light bulbs in the 50-, 60-, 75-, and 100-watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 750 hr and a standard deviation of 60 hr. What is the probability that a TKK light bulb selected at random will burn between 750 and 870 hr? A) B) C) D) E)

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