Answer 131 137 the amount of time necessary for

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137) The amount of time necessary for assembly line workers to complete a product is a normal variable with a mean of 15 minutes and a standard deviation of 2 minutes. So, 70% of the products would be assembled within ________ minutes.
TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 138) True or False: Theoretically, the mean, median, and the mode are all equal for a normal distribution.
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139) True or False: Any set of normally distributed data can be transformed to its standardized form. Answer:
140) True or False: The "middle spread," that is the middle 50% of the normal distribution, is equal to one standard deviation. Answer: True False
141) True or False: A normal probability plot may be used to assess the assumption of normality for a set of data. Answer:
142) True or False: If a data set is approximately normally distributed, its normal probability plot would be S - shaped. Answer:
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 143) The probability that a standard normal variable Z is positive is ________.
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