SOLUTION: Suppose the age a female has her first period is normally distributed with a mean age of
12 years and standard deviation of 2.5 years.
a. Calculate the probability of randomly s
Algebra.Com
Question 1182925: Suppose the age a female has her first period is normally distributed with a mean age of
12 years and standard deviation of 2.5 years.
a. Calculate the probability of randomly selecting a female who will have her first
period after 14 years.
b. Calculate the probability of randomly selecting a female who will have her first
period before 10 years old.
c. Calculate the percentage of females who will have their first period between 12 years
old and 17 years old.
d. A man has a daughter who is now 21 years old and still did not have her first period.
Should he be worried? Explain based on your knowledge of variables that follows a
normal distribution.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x-mean)/sd
>(14-12)/2.5 is z>0.8 with probability 0.2119
-
< (10-12)/2.5 is z < -0.8 with same probability of 0.2119
-
between 12 and 17, this will be with z between 0 and 2 with probability 0.4772
also 2ndVARS 2 normalcdf(12,17,12,2.5) ENTER
-
greater than 21 will be a z>9/2.5 or 3.6 with probability 0.00016. This is very low probability from a statistical standpoint and by age 15 without one a girl has the diagnosis of primary amenorrhea and should be evaluated for hormonal and other issues.
RELATED QUESTIONS
the ages of a group of 50 women are approximately normally distributed with a mean of 48... (answered by ewatrrr)
The age when smokers first start from previous studies is normally distributed with a... (answered by fsdf)
Costumers in a department store are normally distributed with a mean age of 32.3 years... (answered by ewatrrr)
Costumers in a department store are normally distributed with a mean age of 32.3 years... (answered by ewatrrr)
The average years of employee experience at a company with 10,000 employees is normally... (answered by ewatrrr)
At a large publishing company, the mean age of proofreaders is 36.2 years, and the... (answered by ikeoddy)
Suppose that total carbohydrate intake in 12-14 years old males is normally distributed... (answered by Boreal,ewatrrr)
A statistician wants to estimate the mean age of all college students. A random sample of (answered by Boreal)
Hello,
I would need help with these questions please.
1. Find the following... (answered by ashlybussurd@yahoo.com)