Determining z-score and proportion

Assignment Help Basic Statistics

Reference no: EM13106544

Toby's trucking company determined that the distance traveled per truck per year is normally distrinuted, with a mean of 50.0 thousand miles and a standard deviation of 12.0 thousand miles.

a. What proportion of trucks can be expected to travel between 34.0 and 50.0 thousand miles in the year?

b. What percentage of trucks can be expected to travel between 30.0 or above 60.0 thousand miles in the year?

c. How many miles will be traveled by at least 80% of the trucks?

d. What are your answers to (a) through (c) if the standard deviation is 10.0 thousand miles?

Reference no: EM13106544

Questions Cloud

Find the electric flux through surface : A surface completely surrounds a 4.5 × 10-6 C charge. Find the electric flux through this surface when the surface is (a) a sphere with a radius of 0.66 m, (b) a sphere with a radius of 0.30 m, and (c) a cube with edges that are 0.65 m long.

Determining z-scores for test grades : One professor teaches a large section, section A, of a particular class, and on the first test of the term, the test scores in section A were approximately normally distributed with a mean of 78 and a standard deviation of 6.

Find eoq and optimum time between orders : An industrial machine tools manufacturer supplies replacement parts from its inventory. For a particular part, the annual demand is expected to be 750 units.

How far will it travel horizontally during this time : A tennis ball is hit with a vertical speed of 30 m/s and a horizontal speed of 25 m/s. How long will the ball remain in the air? How far will it travel horizontally during this time?

Determining z-score and proportion : Toby's trucking company determined that the distance traveled per truck per year is normally distrinuted, with a mean of 50.0 thousand miles and a standard deviation of 12.0 thousand miles.

In what direction does the normal force act : A block with mass m = 4 kg is sitting on the ground and not moving. The acceleration due to gravity is g = 9.81 m/s2. Please answer the following questions.

Question on z-test : A new company is manufacturing light bulbs. The CEO claims that the average light bulb lasts 260 days. A researcher selects 25 bulbs for testing. The sample bulbs last an average of 250 days with a standard deviation of 20 days.

What is the numerical value of the dragster final speed : a) Write an expression for the magnitude of the force, F, that propels the dragster forward in terms of the variables provided. b) If the track has length L, select the correct symbolic equation for how fast Vf the dragster is traveling when it fi..

Five-step hypothesis z-test : As part of a study of corporate employees, the Director of Human Resources for PNC, Inc. wants to compare the distance traveled to work by employees at their office in downtown Cincinnati with the distance for those in downtown Pittsburgh.

User Account

All Pages