Facebook Page
Twitter
RSS
+ Reply to Thread
Results 1 to 5 of 5
  1. MHB Master
    karush's Avatar
    Status
    Offline
    Join Date
    Jan 2012
    Location
    Wahiawa, Hawaii
    Posts
    1,319
    Thanks
    1,146 time
    Thanked
    323 times
    #1
    this is an image of the given problem

    so for (a) (i) I used $\frac{x-\mu}{\sigma}=z
    \frac{0.70-0.76}{0.06}=-1 = a
    $ and $\frac{0.79-0.76}{0.06}=.5 = b$

    (ii) $P(.70<X)$ z-table for $-1$ is $0.3413$ so $0.3413 + .500 = 0.8413$

    $P(.70<X<.79)$ z-table for $.5$ is $0.1915$ so $0.3413+0.1915=0.5328$

    will get to (b) later
    hope so far is

  2. Pessimist Singularitarian
    MHB Coder
    MHB Math Helper
    MHB Ambassador
    MarkFL's Avatar
    Status
    Offline
    Join Date
    Feb 2012
    Location
    St. Augustine, FL.
    Posts
    11,332
    Thanks
    31,701 times
    Thanked
    26,872 times
    Thank/Post
    2.371
    Trophies
    21 Highscores
    Awards
    MHB Statistics Award (2016)  

MHB Calculus Award (2016)  

MHB Pre-University Math Award (2016)  

MHB Model Helper Award (2015)  

MHB Calculus Award (2015)
    #2
    Looks good so far!

  3. MHB Master
    karush's Avatar
    Status
    Offline
    Join Date
    Jan 2012
    Location
    Wahiawa, Hawaii
    Posts
    1,319
    Thanks
    1,146 time
    Thanked
    323 times
    #3 Thread Author
    (b) (i)


    (ii) z-table for $3\% \approx -1.88$

    so $\frac{c-0.76}{0.06}=-1.88$ thus $c\approx 0.65 s$

    my shaky attempt at this anyway

  4. Pessimist Singularitarian
    MHB Coder
    MHB Math Helper
    MHB Ambassador
    MarkFL's Avatar
    Status
    Offline
    Join Date
    Feb 2012
    Location
    St. Augustine, FL.
    Posts
    11,332
    Thanks
    31,701 times
    Thanked
    26,872 times
    Thank/Post
    2.371
    Trophies
    21 Highscores
    Awards
    MHB Statistics Award (2016)  

MHB Calculus Award (2016)  

MHB Pre-University Math Award (2016)  

MHB Model Helper Award (2015)  

MHB Calculus Award (2015)
    #4
    Again, looks good!

  5. MHB Master
    karush's Avatar
    Status
    Offline
    Join Date
    Jan 2012
    Location
    Wahiawa, Hawaii
    Posts
    1,319
    Thanks
    1,146 time
    Thanked
    323 times
    #5 Thread Author
    Quote Originally Posted by MarkFL View Post
    Again, looks good!
    well, it definitely pays to ask for help...

Similar Threads

  1. [SOLVED] Normal distribution questions
    By karush in forum Basic Probability and Statistics
    Replies: 8
    Last Post: July 16th, 2013, 21:42
  2. [SOLVED] TI-Nspire CX CAS normal distribution graph
    By karush in forum Mathematics Software and Calculator Discussion
    Replies: 2
    Last Post: July 12th, 2013, 20:14
  3. Standard normal
    By Uniman in forum Advanced Probability and Statistics
    Replies: 1
    Last Post: October 31st, 2012, 09:55
  4. conditional normal distribution
    By simon11 in forum Basic Probability and Statistics
    Replies: 16
    Last Post: October 24th, 2012, 09:09
  5. Some considerations about conditional normal distribution...
    By chisigma in forum Advanced Probability and Statistics
    Replies: 1
    Last Post: October 23rd, 2012, 03:01

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Math Help Boards