Question

question 7.

The ages of all kindergarten children are normally distributed with mean 3 years and standard deviation 8 months.

If 49 kindergarten children are randomly selected, what is the probability that their mean age will be younger than 2 years 10 months old?

**Use Table A-2 and write your answer as a decimal with 4
decimal places.**

Selected Answer 0.9599 was WRONG

Answer #1

P ( X < 34 )

Standardizing the value

Z = -1.75

P ( X < 34 ) = P ( Z < -1.75 )

P ( X < 34 ) = 0.0401

Kindergarten children have heights that are approximately
normally distributed about a mean of 39 inches and a standard
deviation of 2 inches. If a random sample of 34 is taken, what is
the probability that the sample of kindergarten children has a mean
height of less than 39.50 inches? (Round your answer to four
decimal places.)
*PLEASE DOUBLE CHECK YOUR WORK, I HAVE BEEN GETTING ALOT OF
WRONG ANSWERS LATELY*

The age of children in kindergarten on the first day of school
is uniformly distributed between 4.91 and 5.97 years old. A first
time kindergarten child is selected at random. Round answers to 4
decimal places if possible.
The mean of this distribution is _______
The standard deviation is _______
The probability that the the child will be older than 5 years
old? _______
The probability that the child will be between 5.01 and 5.51
years old is _______
If...

Kindergarten children have heights that are approximately
normally distributed about a mean of 39 inches and a standard
deviation of 2 inches. If a random sample of 19 is taken, what is
the probability that the sample of kindergarten children has a mean
height of less than 39.50 inches? (Round your answer to four
decimal places.)

Suppose the age that children learn to walk is normally
distributed with mean 12 months and standard deviation 1 month. 7
randomly selected people were asked what age they learned to walk.
Round all answers to 4 decimal places where possible. What is the
distribution of X ? X ~ N( , ) What is the distribution of ¯ x ? ¯
x ~ N( , ) What is the probability that one randomly selected
person learned to walk when...

Suppose the age that children learn to walk is normally
distributed with mean 11 months and standard deviation 1.1 month.
14 randomly selected people were asked what age they learned to
walk. Round all answers to 4 decimal places where possible.
What is the probability that one randomly selected person
learned to walk when the person was between 9.5 and 12.5 months
old?
For the 14 people, find the probability that the average age
that they learned to walk is...

The ages of commercial aircraft are normally distributed with a
mean of
13.5 years and a standard deviation of 6.6519 years. What
percentage of individual aircraft have ages between
11years and17 years? Assume that a random sample of 49 aircraft
is selected and the mean age of the sample is computed. What
percentage of sample mean have ages between 11 years and 17
years?
The percentage of means that have ages between 11 years and 17
years is ____ %...

Suppose the age that children learn to walk is normally
distributed with mean 13 months and standard deviation 2.1
month.
32 randomly selected people were asked what age they learned to
walk. Round all answers to 4 decimal places where possible.
a. For the 32 people, find the probability that the average age
that they learned to walk is between 12.7 and 13.2 months old.
b.Find the IQR for the average first time walking age for groups
of 32 people....

Suppose the age that children learn to walk is normally
distributed with mean 13 months and standard deviation 1.2 month.
13 randomly selected people were asked what age they learned to
walk. Round all answers to 4 decimal places where possible.
What is the distribution of XX? XX ~ N(,)
What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
What is the probability that one randomly selected person
learned to walk when the person was between 12 and 13.5 months...

The heights of kindergarten children are approximately normally
distributed with the following. (Give your answers correct to four
decimal places.) μ = 50 and σ = 2.2 inches (a) If an individual
kindergarten child is selected at random, what is the probability
that he or she has a height between 47.5 and 52.5 inches? (b) A
classroom of 16 of these children is used as a sample. What is the
probability that the class mean x is between 47.5 and...

The heights of kindergarten children are approximately
normally distributed with a mean height of 39 inches and a standard
deviation of 2 inches. If a first-time kindergarten teacher finds
the average height for the 20 students in her class is 40.3 inches,
would that be unusual? Explain.
ANSWER 0.0018
please show step by step ! thank you

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