Normal Curve Standard normal curve: 0 and a 1 A normal curve must be standardized in order to use the z-table. To convert a cutoff value to a standard score use the z x- score formula. z Note: The z table in the text allows for cumulative areas to be determined directly. The picture at the top of the table reminds you that the table is only for areas to the left of the cutoff z. Directions: For each of the following questions, sketch a normal curve and shade the area in the question. LABEL THE SKETCH. Show all work and provide a statement that clearly conveys the question being addrèssed and the answer. A light bulb is advertised as lasting 1000 hours with a standard deviation of 150 hours. Assume the 'life' of a light bulb is normally distributed. Determine the probability that a randomly selected light bulb will last between 1000 and 1250 hours. a. light bulb will last móre than 1250 hours. b. Determine the probability that a randomly selected

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Normal Curve
Standard normal curve:
0 and a 1
A normal curve must be standardized in order to use the z-table. To convert a cutoff value to a standard score use the z
x-
score formula. z
Note: The z table in the text allows for cumulative areas to be determined directly. The picture at the top of the table
reminds you that the table is only for areas to the left of the cutoff z.
Directions: For each of the following questions, sketch a normal curve and shade the area in the question. LABEL THE
SKETCH. Show all work and provide a statement that clearly conveys the question being addrèssed and the answer.
A light bulb is advertised as lasting 1000 hours with a standard deviation of 150 hours. Assume the 'life' of a light bulb is
normally distributed.
Determine the probability that a randomly selected light bulb will last between 1000 and 1250 hours.
a.
light bulb will last móre than 1250 hours.
b. Determine the probability that a randomly selected
Transcribed Image Text:Normal Curve Standard normal curve: 0 and a 1 A normal curve must be standardized in order to use the z-table. To convert a cutoff value to a standard score use the z x- score formula. z Note: The z table in the text allows for cumulative areas to be determined directly. The picture at the top of the table reminds you that the table is only for areas to the left of the cutoff z. Directions: For each of the following questions, sketch a normal curve and shade the area in the question. LABEL THE SKETCH. Show all work and provide a statement that clearly conveys the question being addrèssed and the answer. A light bulb is advertised as lasting 1000 hours with a standard deviation of 150 hours. Assume the 'life' of a light bulb is normally distributed. Determine the probability that a randomly selected light bulb will last between 1000 and 1250 hours. a. light bulb will last móre than 1250 hours. b. Determine the probability that a randomly selected
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