Determine after how many hours should all bulbs be replaced

Assignment Help Electrical Engineering
Reference no: EM13289525

A particular brand of light bulbs is used in a large building of a company. This brand has a normally distributed life span with a mean life of 3600 hours and a standard deviation of 160 hours. The company finds it efficient to periodically replace all the bulbs in the building at the same time. After how many hours should all the bulbs be simultaneously replaced to ensure that no more than 20% of bulbs have failed before they are replaced?

Reference no: EM13289525

Questions Cloud

How would this rank order change : What is the risk factor associated with international investing that potentially can also be viewed as a benefit [and hence, a 4th reason to invest internationally -- see question #1]. IF this factor is trending favorably for your investment portf..
Which will flow into the graduated cylinder : If the Volume of the vessel is 20 then we know that the maximum amount of displaced fluid will be [v] units and when you place the vessel in the water there will be [u] units of fluid displaced, which will flow into the graduated cylinder.
How long could the earth produce the same luminosity as sun : Suppose the earth were made entirely of hydrogen and oxygen, with two atoms of hydrogen for each atom of oxygen. how long could the earth produce the same luminosity as the Sun
Find the magnitude of the net force on the middle block : A horizontal force of with a magnitude of F = 220 N is applied to block 1, What is the magnitude of the net force on the middle block
Determine after how many hours should all bulbs be replaced : The company finds it efficient to periodically replace all the bulbs in the building at the same time. After how many ours should all the bulbs be simultaneously replaced to ensure that no more than 20% of bulbs have failed before they are replace..
What is the velocity of the boat with respect to the ground : The velocity of a boat with respect to the water is 4.0 m/s at an angle of 30.0 degrees NORTH of EAST. What is the velocity of the boat with respect to the ground
What is the water velocity did need to make assumptions : A pitot-static probe is used to measure the velocity of150 C water. If the reading of the connected pressure transducer is 20 cm of water, what is the water velocity Did you need to make any assumptions andif so, what
Organic compounds utilizing an acid base solvent extraction : What steps would you take to separate the following four organic compounds using an acid/base solvent extraction? Compounds: m-anisic acid, p-toluidine, thymol, indane
What is the maximum height reached by the ball : A football resting on the ground is kicked at an angle of 35.0° towards the uprights with an initial speed of 20.0 m/s

Reviews

Write a Review

Electrical Engineering Questions & Answers

  What is the charge on each sphere if two charges are equal

Two small plastic spheres are given positive electrical charges. When they are a distance of 15.6{\rm cm} apart, the repulsive force between them has a magnitude of 0.235{\rm N} .What is the charge on each sphere if the two charges are equal

  Calculate the electrostatic energy that is stored

Calculate the electrostatic energy that is stored in the structure if the intermediate space is filled with a dielectric whose relative dielectric constant is 10 and a voltage is applied between the conductors creating an electric field.

  Calculate the output voltage vo of operational amplifier

Consider the circuit as shown below. If Vin peak voltage = 12V, Calculate the output voltage Vo. Open loop voltage gain of the Operational Amplifier A=10,000. The voltage drop across the diode is 0.7 V.

  What does a carry-out in the fifth place indicate

Assume that you are adding two 4-bit numbers. What does a carry-out (in the fifth place) indicate. Does this carry-out indicate something different when we add two positive numbers, a positive and negative number, or two negative numbers.

  Find how many different choices of officers are possible

A president, secretary, and treasurer are to be chosen from a group of 10 senior members of the IEEE student chapter at the Citadel. Assume that each member cannot serve more than one position.

  Determine the sensitivity of junction depth to changes

how to determine the sensitivity of junction depth to changes in furnace temperature by calculating (dxj/xj)/(dT/T) for a drive diffusion.

  Find the min permissible sag for a span of 225 m

find the MIN permissible SAG for a span of 225 m using a copper conductor with 1.2 cm diameter and allowing a MAX conductor tension of 2200 kg/cm^2 . The horizontal wind pressure is 6 g/cm^2 and specific gravity of copper is 8.9

  Design a voltage-divider network to supply the load

The voltage across the load must remain between 4.7 and 5.0 V for all values of load current. Design a voltage-divider network to supply the load. You may assume that resistors of any value desired are available.

  Calculate unit length resistance in inner n outer conductors

The cylindrical coaxial cable with the cross section shown below, has inner and outer radii of 5mm and 15mm respectively. The dielectric parameters are; er=2, signma=5*10^(-10) S/m and Ur=1

  Calculate the reactive power consumed by the converter

A Three phase thyristor converter, VLL=460V (rms) at 60 Hz, and Ls=5mH, the firing angle "a " is 30 degrees electrical, the converter is consuming 5Kw, the DC current is assumed to be constant.

  Determine how many holes are in the valence band

a)How many holes are in the valence band b)If electrons are constantly seeking lower energies and recombining with holes then how can the number of 10billion remain constant.

  What is the voltage regulation under the conditions

A 13,800/480 V three-phase Wye-Delta-connected transformer bank consists of three identical 100-kVA 7967/480-V transformers. It is supplied with power directly from a large constant-voltage bus.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd