Question

The diameters of ball bearings are distributed normally. The mean diameter is 135millimeters and the variance is 9. Find the probability that the diameter of a selected bearing is between 137 and 139millimeters. Round your answer to four decimal places.

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The diameters of ball bearings are distributed normally. The
mean diameter is 89 millimeters and the variance is 9. Find the
probability that the diameter of a selected bearing is between 83
and 91 millimeters. Round your answer to four decimal
places.

The diameters of ball bearings are distributed normally. The
mean diameter is 96 millimeters and the standard deviation is 6
millimeters.
Find the probability that the diameter of a selected bearing is
between 89 and 105 millimeters. Round your answer to four decimal
places.

The diameters of ball bearings are distributed normally. The
mean diameter is 125 millimeters and the standard deviation is 3
millimeters. Find the probability that the diameter of a selected
bearing is greater than 127 millimeters. Round your answer to four
decimal places.

The diameters of ball bearings are distributed normally. The
mean diameter is 106 millimeters and the standard deviation is 4
millimeters. Find the probability that the diameter of a selected
bearing is greater than 111 millimeters. Round your answer to four
decimal places

The diameters of ball bearings are distributed normally. The
mean diameter is 120120 millimeters and the standard deviation is
44 millimeters. Find the probability that the diameter of a
selected bearing is greater than 125125 millimeters. Round your
answer to four decimal places.

The diameters of ball bearings are distributed normally. The
mean diameter is 120 millimeters and the standard deviation is 4
millimeters. Find the probability that the diameter of a selected
bearing is greater than 125 millimeters. Round your answer to four
decimal places.

The diameters of ball bearings are known to be normally
distributed with mean 6.15 cm standard deviation 0.72 cm. Find the
probability that a randomly selected ball bearing has a diameter
less than 6.25 cm. Find the probability that a randomly selected
ball bearing has a diameter greater than 6.50 cm. Find the
diameters a and b such that the middle 80% of ball bearing
diameters are between a and b.

Precision manufacturing: A process manufactures ball bearings
with diameters that are normally distributed with mean 24.3
millimeters and standard deviation 0.08 millimeters. (a) What
proportion of the diameters are less than 24.2 millimeters? (b)
What proportion of the diameters are greater than 24.5 millimeters?
(c) To meet a certain specification, a ball bearing must have a
diameter between 24 and 24.5 millimeters. What proportion of the
ball bearings meet the specification? Round the answers to at least
four decimal places.

A process manufactures ball bearings with diameters that are
normally distributed with mean 25.1 millimeters and standard
deviation 0.08 millimeter.
(a) What proportion of the diameters are less than 25.0
millimeters?
(b) What proportions of the diameters are greater than 25.4?
(c) To meet a certain specification, a ball bearing must have a
diameter between 25.0 and 25.3 millimeters. What proportions of the
ball bearings meet specification?
(d) Find the 95th percentile of the diameters.

An industrial sewing machine uses ball bearings that are
targeted to have a diameter of 0.78 inch. The lower and upper
specification limits under which the ball bearings can operate are
0.76 inch and 0.80
inch, respectively. Past experience has indicated that the
actual diameter of the ball bearings is approximately normally
distributed, with a mean of
0.782 inch and a standard deviation of 0.008 inch. Complete
parts (a) through (e) below.
a. What is the probability that a ball...

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