1000 Light Bulbs

by Subodh
(India)

1000 light bulbs with a mean life of 120 days are installed in a new factory and their length of life is normally distributed with a standard deviation of

30 days.

I need the answer & how to solve it.

Thanks'
&
regards

Comments for 1000 Light Bulbs

Average Rating starstarstarstarstar

Click here to add your own comments

Rating
starstarstarstarstar
ANSWER
by: MATHS LEARNER`

1000 light bulbs with a mean life of 120 days are installed in a new factory and their length of life
is normally distributed with a standard deviation of 30 days
ANS : TAKE X PWR 1 =1000
MEU = 120
SD = 30

Z=120-1000/20

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to views.

Recent Articles

  1. I Don't Know What to Put Here?

    Feb 23, 18 03:24 PM

    OK, I am a 13-year-old caucasian male who took a Mensa test and got 186 IQ, based on this website it says I amHigh Genius but currently only have a 2.5

    Read More

  2. IQ Rating Scale and Categories of Genius and Feeble-minded People

    Feb 19, 18 03:12 PM

    Conventional IQ Rating Scale starts at 10 and may go above 200 IQ scores. Your results depends upon your replies, nature, nurture, and quality of the IQ test. Let's explore

    Read More

  3. A brief history of IQ Tests

    Feb 18, 18 02:25 PM

    History of IQ tests goes back when the first man was hired for a job. However, Binet Simon Scale led the path for other tools. It is also one of the War War-I positive externalities.

    Read More