× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
g
3
3
2
J
2
p
2
m
2
h
2
s
2
r
2
d
2
l
2
a
2
New Topic  
Stevbo Stevbo
wrote...
Posts: 100
Rep: 0 0
7 years ago
A previous study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams. How many nickels does a coin counter manufacturer need to weigh so that she can be 98% confident that her sample mean is within 25 milligrams of the true average weight of a nickel?

  A.36

  B.196

  C.239

  D.139

Read 442 times
1 Reply

Related Topics

Replies
wrote...
Educator
7 years ago
194.82 -- B
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1085 People Browsing
 110 Signed Up Today
Related Images
  
 509
  
 291
  
 235
Your Opinion
Which is the best fuel for late night cramming?
Votes: 145

Previous poll results: What's your favorite math subject?