Amanufacturing plant uses light bulbs whose life spans are normally distributed, with mean and standard deviation equal to 600 and 40 hours, respectively. in order to minimize the number of bulbs that burn out during operating hours, all the bulbs are replaced after a given period of operation. how often (in hr) should the bulbs be replaced if we wish no more than 2% of the bulbs to burn out between replacement periods? (round your answer to two decimal places.)

The bulbs be replaced after 517.85 hours, in order to maintain no more than 2% of the bulbs to burn out between replacement periods.

Step-by-step explanation:

Consider the provided information.

We need to find out the periods of replacement if we wish no more than 2% of the bulbs to burn out between replacement periods.

By using standard normal table find the critical value.

Corresponding critical value to the left tail is -2.0537

The value of μ=600 and σ=40.

Substitute the respective values as shown:

Hence, the bulbs be replaced after 517.85 hours, in order to maintain no more than 2% of the bulbs to burn out between replacement periods.

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

ask for details followreport by buttfacelily 2 minutes ago

answers

rauschg

rauschg · hand

know the answer? add it here!

step-by-step explanation: