Question

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 3.2 years, and standard deviation of 0.7 years. If 12 items are picked at random, 10% of the time their mean life will be less than how many years? Give your answer to one decimal place.

Answer #1

Given that,

_{}
=
/
n = 0.7 /
12

P(Z < -1.28) = 0.10

z = -1.28

= z *
_{}+
_{}
= -1.28 * 0.7 /
12 + 3.2 = **2.9**

**Answers = 2.9 years**

A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 5 years, and standard
deviation of 0.7 years.
If 20 items are picked at random, 6% of the time their mean life
will be less than how many years?
Give your answer to one decimal place.

A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 9.3 years, and standard
deviation of 2.7 years.
If 10 items are picked at random, 7% of the time their mean life
will be less than how many years?
Give your answer to one decimal place.

A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 7.6 years, and standard
deviation of 2.1 years.
If 11 items are picked at random, 6% of the time their mean life
will be less than how many years?
Give your answer to one decimal place.

A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 4 years, and standard
deviation of 1.1 years. If 17 items are picked at random, 4% of the
time their mean life will be less than how many years? Give your
answer to one decimal place.

A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 12.8 years, and standard
deviation of 2.4 years. If 22 items are picked at random, 7% of the
time their mean life will be less than how many years? Give your
answer to one decimal place.

A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 3.9 years, and standard
deviation of 1.2 years. If 7 items are picked at random, 5% of the
time their mean life will be less than how many years? Give your
answer to one decimal place.

a manufacturer knows that their items have a normally
distributed lifespan, with a mean of 11.7 years, and standard
deviation of 0.7 years. if 6 items are picked at random, 10% of the
time their mean life will be less than how many years?

A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 12.8 years, and standard
deviation of 2.9 years. If 5 items are picked at random, 2% of the
time their mean life will be less than how many years?

QUESTION PART A: A manufacturer knows that their items have a
normally distributed lifespan, with a mean of 6.6 years, and
standard deviation of 0.8 years.
If 22 items are picked at random, 6% of the time their mean life
will be less than how many years?
Give your answer to one decimal place.
QUESTION PART B: A particular fruit's weights are normally
distributed, with a mean of 679 grams and a standard deviation of
19 grams.
If you pick...

A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 10.3 years, and standard
deviation of 2.4 years. The 10% of items with the shortest lifespan
will last less than how many years? Give your answer to one decimal
place.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 2 minutes ago

asked 9 minutes ago

asked 15 minutes ago

asked 16 minutes ago

asked 22 minutes ago

asked 22 minutes ago

asked 35 minutes ago

asked 38 minutes ago

asked 45 minutes ago

asked 47 minutes ago

asked 51 minutes ago