Question

13. The mean number of words per minute (WPM) typed by a speed typist is 140 with a variance of 196.

What is the probability that the sample mean would differ from the population mean by more than 4.5 WPM if 76 speed typists are randomly selected? Round your answer to four decimal places.

15. The operation manager at a tire manufacturing company believes that the mean mileage of a tire is 37,724 miles, with a standard deviation of 2536 miles.

What is the probability that the sample mean would be less than 37,502 miles in a sample of 33 tires if the manager is correct? Round your answer to four decimal places.

Answer #1

Suppose that the distribution Of typing speed in words per minute
for experience typists using a new type of split keyboard can be
approximated by a normal curve with a mean 64 words per minute and
standard deviation 16 words per minute.
a) what is the probability that a randomly selected typist
speed is At most 64 wpm?
b) What is the probability that a randomly selected typing
speed is less than 64 words per minute?
c) what is the...

The mean number of words per minute (WPM) read by sixth graders
is 81 with a standard deviation of 17 WPM. If 130 sixth graders are
randomly selected, what is the probability that the sample mean
would differ from the population mean by greater than 2.11 WPM?
Round your answer to four decimal places.

The mean number of words per minute (WPM) read by sixth graders
is 83 with a standard deviation of 12 WPM. If 89 sixth graders are
randomly selected, what is the probability that the sample mean
would differ from the population mean by greater than 1.4 WPM?
Round your answer to four decimal places.

The operation manager at a tire manufacturing company believes
that the mean mileage of a tire is 20,138 miles, with a variance of
10,304,100. What is the probability that the sample mean would
differ from the population mean by less than 236 miles in a sample
of 171 tires if the manager is correct? Round your answer to four
decimal places.

The mean number of words per minute
(WPM) read by sixth graders is 93 with a standard deviation of 22.
If 30 sixth graders are randomly selected, what is the probability
that the sample mean would be greater than 97.95 WPM? (Round your
answer to 4 decimal places). Show work.

. The mean number of words per minute (WPM) read by sixth
graders is 87 with a population standard deviation of 10. If 60
sixth graders are randomly selected, what is the probability that
the sample mean would differ from the population mean by more than
5 WPM?

A company measured the typing speed in words per minute (wpm)
for a sample of experienced typists using a new type of keyboard
design. The mean wpm was 62.5.
(a) What is the research question of interest for this
survey?
(b) What is the population parameter in this study? What is the
appropriate statistical notation (symbol) for this parameter?
(c) What is the sample statistic in this study? What is the
appropriate statistical notation (symbol) for this statistic?

PLEASE DOUBLE CHECK ANSWER & NO HANDWRITTEN ANSWERS.
THANKS!
The operation manager at a tire manufacturing company believes
that the mean mileage of a tire is 46,619 miles, with a variance of
8,145,316 . What is the probability that the sample mean would be
less than 46,742 miles in a sample of 88 tires if the manager is
correct? Round your answer to four decimal places.

1)
The mean per capita income is 21,053 dollars per annum with a
standard deviation of 805 dollars per annum.
What is the probability that the sample mean would be less
than 20876 dollars if a sample of 71 persons is randomly
selected? Round your answer to four decimal places.
2) Assume the random variable X has a binomial distribution with
the given probability of obtaining a success. Find the following
probability, given the number of trials and the probability of...

A law firm has open several positions for professional typists.
The number of words per minute (wpm) typed by the group of
applicants follows a normal distribution with mean 67 wpm and a
standard deviation of 9 wpm.
What should be the limit if only the top 15% are to be eligible?
Round your answer to the nearest whole word.

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