Question

The personnel office at a large electronics firm regularly
schedules job interviews and maintains records of the interviews.
From the past records, they have found that the length of a first
interview is normally distributed, with mean *μ* = 34
minutes and standard deviation *σ* = 6 minutes. (Round your
answers to four decimal places.)

(a) What is the probability that a first interview will last 40
minutes or longer?

(b) Six first interviews are usually scheduled per day. What is the
probability that the average length of time for the six interviews
will be 40 minutes or longer?

How hot is the air in the top (crown) of a hot air balloon?
Information from *Ballooning: The Complete Guide to Riding the
Winds*, by Wirth and Young (Random House), claims that the air
in the crown should be an average of 100°C for a balloon to be in a
state of equilibrium. However, the temperature does not need to be
exactly 100°C. What is a reasonable and safe range of temperatures?
This range may vary with the size and (decorative) shape of the
balloon. All balloons have a temperature gauge in the crown.
Suppose that 60 readings (for a balloon in equilibrium) gave a mean
temperature of *x* = 97°C. For this balloon, *σ* ≈
14°C.

(c) Compute a 95% confidence interval for the average temperature at which this balloon will be in a steady-state equilibrium. (Round your answers to one decimal place.)

lower limit | |

upper limit |

Answer #1

(a)

The z-score for X =40 is

The probability that a first interview will last 40 minutes or longer is

(b)

The z-score for is

So the probability that the average length of time for the six interviews will be 40 minutes or longer

(c)

**Answer:**

Lower limit: 93.4

Upper limit: 100.6

The personnel office at a large electronics firm regularly
schedules job interviews and maintains records of the interviews.
From the past records, they have found that the length of a first
interview is normally distributed, with mean μ = 36
minutes and standard deviation σ = 8 minutes. (Round your
answers to four decimal places.)
(a) What is the probability that a first interview will last 40
minutes or longer?
(b) Fifteen first interviews are usually scheduled per day. What...

The personnel office at a large electronics firm regularly
schedules job interviews and maintains records of the interviews.
From the past records, they have found that the length of a first
interview is normally distributed, with mean μ = 36
minutes and standard deviation σ = 7 minutes. (Round your
answers to four decimal places.)
(a) What is the probability that a first interview will last 40
minutes or longer?
(b) Thirteen interviews are usually scheduled per day. What is...

A. The personnel office at a large electronics firm regularly
schedules job interviews and maintains records of the interviews.
From the past records, they have found that the length of a first
interview is normally distributed, with mean μ = 38 minutes and
standard deviation σ = 4 minutes. (Round your answers to four
decimal places.)
(i) What is the probability that a first interview will last 40
minutes or longer?____________________
(ii) Ten first interviews are usually scheduled per day....

How hot is the air in the top (crown) of a hot air balloon?
Information from Ballooning: The Complete Guide to Riding the
Winds, by Wirth and Young (Random House), claims that the air
in the crown should be an average of 100°C for a balloon to be in a
state of equilibrium. However, the temperature does not need to be
exactly 100°C. What is a reasonable and safe range of temperatures?
This range may vary with the size and...

How hot is the air in the top (crown) of a hot air balloon?
Information from Ballooning: The Complete Guide to Riding the
Winds, by Wirth and Young (Random House), claims that the air
in the crown should be an average of 100°C for a balloon to be in a
state of equilibrium. However, the temperature does not need to be
exactly 100°C. What is a reasonable and safe range of temperatures?
This range may vary with the size and...

How hot is the air in the top (crown) of a hot air balloon?
Information from Ballooning: The Complete Guide to Riding the
Winds, by Wirth and Young (Random House), claims that the air
in the crown should be an average of 100°C for a balloon to be in a
state of equilibrium. However, the temperature does not need to be
exactly 100°C. What is a reasonable and safe range of temperatures?
This range may vary with the size and...

Question #1
How hot is the air in the top (crown) of a hot air balloon?
Information from Ballooning: The Complete Guide to Riding the
Winds, by Wirth and Young (Random House), claims that the air in
the crown should be an average of 100°C for a balloon to be in a
state of equilibrium. However, the temperature does not need to be
exactly 100°C. What is a reasonable and safe range of temperatures?
This range may vary with the...

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