The lifespan of a particular brand of light bulb is

Reference no: EM13612428

The lifespan of a particular brand of light bulb is normally distributed with a mean life of 400 h and a standard deviation of 12 h. Production for the last week was 800,000 light bulbs. Use this information to answer the following questions.

a) What is the z value of a light bulb having a life of 421 h?

b) How many light bulbs can be expected to have a life less than 379 h?

c) What percent of the light bulbs should have a life less than 430 h?

Reference no: EM13612428

Questions Cloud

An abbreviated cash budget for big chuck enterprises : an abbreviated cash budget for big chuck enterprises follows. big chuck wishes to maintain a 10000 minimum cash balance

The operating reflux ratio is 30 assume that raoults law : distillation of multicomponent alcohol mixture. a feed of 30 mol methanol a 20 ethanol b 15 n-propanol c and 35

Toss five fair coins and let x equal the number of heads : toss five fair coins and let x equal the number of heads observeda. identify the sample points associated with this

Determine the half-angle of the wedge and the ratios of : in a helium wind tunnel flow at mach 4.0 passes over a wedge of unknown half-angle aligned symmetrically with the flow.

The lifespan of a particular brand of light bulb is : the lifespan of a particular brand of light bulb is normally distributed with a mean life of 400 h and a standard

If the mass is displaced by 10mm from its equilibrium : if a mass of 0.3 kg is suspended from a spring of stiffness 200nm-1. if the mass is displaced by 10mm from its

Part a what will be the average collection period part b : if accounts receivables turnover ratio for the year 2012 was 5 timespart a what will be the average collection

When the resistors are connected in parallel to the battery : two resistors have resistances rsmaller and rlarger where rsmaller lt rlarger. when the resistors are connected in

Estimate the screw torque erquired to raise the load if : a square-threaded power screw with single thread is used to raise a load of 25000lb. the screw has a mean diameter of 1

User Account

All Pages