Question

Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 68 miles per hour, with a standard deviation of 5 miles per hour. Estimate the percent of vehicles whose speeds are between 63 miles per hour and 73 miles per hour. (Assume the data set has a bell-shaped distribution.)

Answer #1

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vehicles whose speeds are between 63 miles per hour and 73 miles
per hour.

Use the Empirical Rule. The mean speed of a sample of vehicles
along a stretch of highway is 67 miles per hour, with a standard
deviation of 3miles per hour. Estimate the percent of vehicles
whose speeds are between 64miles per hour and 70miles per hour.
(Assume the data set has a bell-shaped distribution.)

Use the Empirical Rule. The mean speed of a sample of vehicles
along a stretch of highway is
66 miles per hour, with a standard deviation of 5 miles per
hour. Estimate the percent of vehicles whose speeds are between
51 miles per hour and 81 miles per hour. (Assume the data set
has a bell-shaped distribution.)
Approximately what % of vehicles travel between 51 miles per
hour and 81 miles per hour.

use
the empirical rule the main speed of a sample of vehicles along a
stretch of highway is 63 mph with a standard deviation of 5 mph
estimate the percent of vehicles his speeds are between 53 mph and
73 mph. (assume the data set has a bell shaped distribution)
approximately ____% of vehicles travel between 53 mph and 73
mph

The mean speed of vehicles along a stretch of highway is
56 miles per hour with a standard deviation of 4 miles per
hour. You measure the speeds of three cars traveling
along Route 440 as 62 miles per hour, 47 miles per hour, and 56
miles per hour. Find the Z-score that corresponds to
each speed. What can you conclude?

The speeds for eight more vehicles are listed. The mean speed of
a sample of vehicles along a stretch of highway is 67 miles per
hour, with a standard deviation of 4 miles per hour determine which
of the data entries are unusual. Are any of the data entries very
unusual? Explain your reasoning.
70, 78, 62, 71, 65, 76, 82, 64

Chief Grady wants to know whether the mean speed of vehicles on
a particular stretch of Pat Bay Highway exceeds the posted speed
limit of 90 km per hour. He has a sample of 35 car speeds with a
mean speed of 93 km per hour and a sample standard deviation of 4
km per hour. Chief Grady wishes to estimate the true mean speed of
all vehicles passing this stretch of Pat Bay Highway using a 95%
confidence interval....

According to the Empirical rule, sometimes called the Normal
rule, for a symmetrical, bell shaped distribution of data, we will
find that approximately what percent of observations are contained
within plus and minus one standard deviation of the mean A. 50 B.
68 C. 75 D. 95

The mean value of land and buildings per acre from a sample of
farms is $1500 , with a standard deviation of $100. The data set
has a bell-shaped distribution. Assume the number of farms in the
sample is 71. (a) Use the empirical rule to estimate the number of
farms whose land and building values per acre are between $1300 and
$1700

The mean value of land and buildings per acre from a sample of
farms is $1500, with a standard deviation of $100. The data set
has a bell-shaped distribution. Assume the number of farms in the
sample is 71.
(a) Use the empirical rule to estimate the number of farms
whose land and building values per acre are between $1300 and
$1700.

2.4.31 The mean value of land and buildings per acre from a
sample of farms is $1300 , with a standard deviation of $200 .
The data set has a bell-shaped distribution. Assume the number of
farms in the sample is 72 .
(a) Use the empirical rule to estimate the number of farms
whose land and building values per acre are between
$1100
and
$1500
.

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