statistics
posted by UPD .
Information given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm
first question
the prob that HC of a random chosen man is larger than 57.8cm is?
Work: pr(x)>57.8cm
z=(57.856)=1.8>.9641 i got it wrong?
Second ques:
what is is the sampling distrubution of the avg HC of 9 random selected men?
Third: the prob that the average HC of 9 random selected men is larger then 57.8cm is?
Respond to this Question
Similar Questions

Math (Statistic)
Considered the sampling distribution of a sample mean obtained by random sampling from an infinite population. This population has a distribution that is highly skewed toward the larger values. a) How is the mean of the sampling distribution … 
statistics
Info given:With a random sample of 9 men. let X denote the number of men with head circumference larger than 57.8cm. the normal mean=56cm and standard dev=1.8cm. So this is a binomal dis they ask; For X, calculate pr(X=2)? 
Stats
nformation given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm first question the prob that HC of a random chosen man is larger than 57.8cm is? 
stats
Info given:With a random sample of 9 men. let X denote the number of men with head circumference larger than 57.8cm. the normal mean=56cm and standard dev=1.8cm. So this is a binomal dis they ask; For X, calculate pr(X=2)? 
MATH
Which of the following normal distributions has the smallest spread? 
stats
the head circumferences of adult males have a bellshaped distribution with the mean= 65cm and standard deviation =2cm. a. what is the head circumference such that only 2.5% of adult males have a smaller head circumference? 
prob and stats
11. Assume that the population of heights of male college students is approximately normally distributed with mean m of 72.15 inches and standard deviation s of 6.39 inches. A random sample of 96 heights is obtained. Show all work. … 
Statistics
DIAGRAMS MUST BE DRAWN Given the standard normal distribution, determine:Prob Z greater than 1.50 Prob Z between1.06 and 1.96 Given the standard normal distribution determine the Z values that contain 80% in the middle of the curve. 
Statistics
The following is a histogram (right skewed) of the first ten terms of a geometric distribution with p = .4. The mean of this distribution is 2.5 and the standard deviation is approximately 1.93. What's the shape of the distribution … 
Statistics
Suppose the heights of 18yearold men are approximately normally distributed, with mean 66 inches and standard deviation 4 inches. (a) What is the probability that an 18yearold man selected at random is between 65 and 67 inches …