Ask Question
26 August, 00:53

For a certain type of computers, the length of time between charges of the battery is normally distributed with a mean of 50 hours and a standard deviation of 15 hours. John owns one of these computers and wants to know the probability that the length of time will be between 50 and 70 hours.

A. 0.4082

B. 0.4025

C. 0.4213

D. 0.4156

+5
Answers (1)
  1. 26 August, 02:49
    0
    A. 0.4082

    Step-by-step explanation:

    According to the given data

    mean 'μ' = 50

    standard deviation 'σ'=15

    In order to find the probability for 50
    Z = (x-μ) / σ



    when x=50, Z will be zero

    therefore, Z=0

    when x=70,

    Z = (70-50) / 15

    Z = 20/15

    Z=1.33

    next is to find the probability for 50
    for standard form 0
    By using Z-table, the area is equal to 0.4082

    Thus, probability that the length of time will be between 50 and 70 hours is 4082
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “For a certain type of computers, the length of time between charges of the battery is normally distributed with a mean of 50 hours and a ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers