Question

Suppose that scores on a particular test are normally distributed with a mean of 110 and a standard deviation of 19 . What is the minimum score needed to be in the top 15% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place.

Answer #1

Problem Page Suppose that IQ scores in one region are normally
distributed with a standard deviation of 15 . Suppose also that
exactly 60% of the individuals from this region have IQ scores of
greater than 100 (and that 40% do not). What is the mean IQ score
for this region? Carry your intermediate computations to at least
four decimal places. Round your answer to at least one decimal
place.

The distribution of scores on a standardized aptitude test is
approximately normal with a mean of 500 and a standard deviation of
95 What is the minimum score needed to be in the top 20%
on this test? Carry your intermediate computations to at least
four decimal places, and round your answer to the nearest
integer.

Suppose that the scores on a reading ability test are normally
distributed with a mean of 60 and a standard deviation of 8. What
proportion of individuals score at least 49 points on this test?
Round your answer to at least four decimal places.

The scores on an examination in finance are approximately
normally distributed with mean 500 and an unknown standard
deviation. The following is a random sample of scores from this
examination.
447, 458, 492, 519, 571, 593, 617
Find a 95% confidence interval for the population standard
deviation. Then complete the table below. Carry your intermediate
computations to at least three decimal places. Round your answers
to at least two decimal places.

Assume that a set of test scores is normally distributed with a
mean of 100 and a standard deviation of 10 . Use the 68-95-99.7
rule to find the following quantities. a. The percentage of scores
less than 110 is %. (Round to one decimal place as needed.) b.
The percentage of scores greater than 110 is nothing %. (Round to
one decimal place as needed.)

assume that a set of test scores is normally
distributed with the mean of 110 and a standard deviation of 15.
use the 86-95-99.7 rule

Suppose that the lifetimes of TV tubes are normally distributed
with a standard deviation of 1.1 years. Suppose also that exactly
40% of the tubes die before 5 years. Find the mean lifetime of TV
tubes. Carry your intermediate computations to at least four
decimal places. Round your answer to at least one decimal
place.

The scores on an examination in economics are approximately
normally distributed with mean 500 and an unknown standard
deviation. The following is a random sample of scores from this
examination.
434, 448, 502, 522, 579, 586, 635
Carry your intermediate computations to at least three decimal
places. Round your answers to at least two decimal places.Find a
90% confidence interval for the population standard deviation. Then
complete the table below.
(Upper and lower confidence interval)

Assume that a set of test scores is normally distributed with a
mean of 100 and a standard deviation of 10. Use the 68-95-99.7
rule to find the following quantities.
a. The percentage of scores less than 100 is __%
b. The percentage of scores greater than 110 is __%
c. The percentage of scores between 80 and 110 is __%
(Round to one decimal place as needed)

Suppose that the speeds of cars travelling on California
freeways are normally distributed with a mean of 60 miles/hour. The
highway patrol's policy is to issue tickets for cars with speeds
exceeding 80 miles/hour. The records show that exactly 5% of the
speeds exceed this limit. Find the standard deviation of the speeds
of cars travelling on California freeways. Carry your intermediate
computations to at least four decimal places. Round your answer to
at least one decimal place.

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