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1. A variable is normally distributed in the population with a mean of 100 and a...

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Basic Math

1. A variable is normally distributed in the population with amean of 100 and a standard deviation of 10. A sample of 20 israndomly selected. The probability that the sample mean is between90 and 110 is _______ the probability that the variable is between90 and 110.

greater than

less than

equal to

not comparable with

2.the general manager of a logistic consulting group believesthat 28% of the firm's orders come from new customers. A simplerandom sample of 120 orders was selected. Using the manager'sbelief, determine:


1. The standard error for the sampling distribution ofproportion.  (3 decimal places)
2. The probability that the proportion of firm's orders thatcome from new customers is outside the range of 25% to31%  (3 decimal places)

Answer & Explanation Solved by verified expert
3.7 Ratings (279 Votes)
1Correct optiongreater thanEXPLANATIONIn the case of sample meanStandard Error 10 44721For from 90 to mid valueZ 90    See Answer
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