Suppose the age that children learn to walk is normally distributed with mean 12 months and standard deviation 2.2 month. 34 randomly selected people were asked what age they learned to walk. Round all answers to 4 decimal places where possible. a. What is the probability that one randomly selected person learned to walk when the person was between 11.7 and 12.5 months old? 0.1441 b. For the 34 people, find the probability that the average age that they learned to walk is between 11.7 and 12.5 months old. 0.6964 X c. For part b, is the assumption that the distribution is normal necessary? Yes No d. Find the 1QR for the average first time walking age for groups of 34 people. Round to two decimal places. Q1 10.52 X months %3D Q3 =| 13.49 X months %3D IQR: 2.80 X months

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Suppose the age that children learn to walk is normally
distributed with mean 12 months and standard deviation
2.2 month.
34 randomly selected people were asked what age they
learned to walk. Round all answers to 4 decimal places
where possible.
a. What is the probability that one randomly selected
person learned to walk when the person was
between 11.7 and 12.5 months old? 0.1441
b. For the 34 people, find the probability that the
average age that they learned to walk is between
11.7 and 12.5 months old. 0.6964 X
c. For part b, is the assumption that the distribution is
| Yes
No
normal necessary?
d. Find the IQR for the average first time walking age
for groups of 34 people. Round to two decimal
places.
Q1 = 10.52 X months
Q3 =| 13.49
X months
IQR: 2.80
X months
Transcribed Image Text:Suppose the age that children learn to walk is normally distributed with mean 12 months and standard deviation 2.2 month. 34 randomly selected people were asked what age they learned to walk. Round all answers to 4 decimal places where possible. a. What is the probability that one randomly selected person learned to walk when the person was between 11.7 and 12.5 months old? 0.1441 b. For the 34 people, find the probability that the average age that they learned to walk is between 11.7 and 12.5 months old. 0.6964 X c. For part b, is the assumption that the distribution is | Yes No normal necessary? d. Find the IQR for the average first time walking age for groups of 34 people. Round to two decimal places. Q1 = 10.52 X months Q3 =| 13.49 X months IQR: 2.80 X months
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