× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
a
5
1
New Topic  
RioNii RioNii
wrote...
Posts: 280
Rep: 3 0
2 years ago
Instructions:
a) Identify the type of probability distribution shown in the problem: binomial, hypergeometric, poisson etc.
b) Identify the given in the problem.
c) Solve for the probability.

4) The length of time, L hours, that a phone will work before it needs charging is normally distributed with a mean of 100 hours and standard deviation of 15 hours. Find the probability that a randomly selected phone will work greater than 127 hours before it needs charging.
Read 188 times
1 Reply

Related Topics

Replies
Anonymous
wrote...
2 years ago
This is a normal distribution model:

f(x)=1σ2πe0.5(xμσ)2

Quote
The length of time, L hours, that a phone will work before it needs charging is normally distributed with a mean of 100 hours and standard deviation of 15 hours. Find the probability that a randomly selected phone will work greater than 127 hours before it needs charging.

μ = 100
σ = 15
x = 127

z=12710015=2715

P(x>127) = 1 - P(x≤127)

= 1 - (27/15)

Using your calculator:

normalcdf(-999,127,100,5)= 1 - .964 = .036
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  820 People Browsing
Show Emoticons
:):(;):P:D:|:O:?:nerd:8o:glasses::-):-(:-*O:-D>:-D:o):idea::important::help::error::warning::favorite:
Related Images
  
 26
  
 398
  
 231
Your Opinion
What's your favorite math subject?
Votes: 679

Previous poll results: Who's your favorite biologist?