DC MyStatLab STA 215 x Take a Test-Sarah Gabl x C secure I ht aspx testld 154926
ID: 3218939 • Letter: D
Question
DC MyStatLab STA 215 x Take a Test-Sarah Gabl x C secure I ht aspx testld 154926128 STA 215 Intro to Statistical Reasoning, Mw. Spring 17.25153 Quiz: Quiz 3 (Chapters 12, 15, 16, 17) This Question: 1 pt 3 of 21 (2 complete) v This Quiz: 21 pts post Assume that duration of human pregnancies can be described by a normal model with mean 265 days and standard deviation 19 days. Answer the folowing questons. a) What percentage of pregnancies should last between 275 and 280 days? (Round to one decrmal place as needed.) bl At least how many should the longest 20% of all Po 2 020 (Round to one decimal place as needed c) Suppose a certain obstetrician is oamently providing prenatal care to 20 pregnant women Let y represent the mean length of their pregnancies According tothe central lmit theorem, what is the mean and standard deviation SDOy) of the normal model of the distribution of the sample mean, y? The mean is sDty) l (Round to two decimal places as needed) dl What is the probabilty that the mean duration of these patients pregnancies be less than 261 days? Ply 26103 (Round to three decimal places as needed) Enter your answer in each ofthe answer boxes s 12:12 v BExplanation / Answer
2nd Question:
We have been given params of the binomial dist.
p = .767
n=3
x=1
P(X>=1)
= 1-P(X=0)
=1- (3C0)(.767^0)(.232^3)
=.9875
or 98.7%
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.