Treatment of cotton fabrics

Assignment Help Basic Statistics

Reference no: EM131011684

Treatment of cotton fabrics.

"Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the strength of the fabric. The breaking strength of untreated fabric is Normally distributed with mean 57 pounds and standard deviation 2.2 pounds. The same type of fabric after treatment has Normally distributed breaking strength with mean 30 pounds and standard deviation 1.6 pounds.9 A clothing manufacturer tests 6 specimens of each fabric. All 12 strength measurements are independent.

(a) What is the probability that the mean breaking strength of the 6 untreated specimens exceeds 50 pounds?

(b) What is the probability that the mean breaking strength of the 6 untreated specimens is at least 25 pounds greater than the mean strength of the 6 treated specimens?

Reference no: EM131011684

Questions Cloud

Calculate the NPV of the project : Sanders Enterprises, Inc., has been considering the purchase of a new manufacturing facility for $288,000. The facility is to be fully depreciated on a straight-line basis over seven years. It is expected to have no resale value after the seven years..

How do flotation costs affect the cost of capital : How do flotation costs affect the cost of capital? Are these costs about the same for each of the three capital components? How do they change as the firm raises larger and larger amounts of capital, and how do flotation costs affect the way a compan..

Differences between criminologists and criminalists : Explain the differences between criminologists and criminalists and their respective areas of study. How are the criminologists and criminalists used in the public sector (working within a governmental body)? How are they used in the private secto..

Identify the inflation rate of your home country : Identify the inflation rate of your home country and some well-known foreign country. Then identify the percentage change of your home currency with respect to that foreign country. Did the currency change in the direction and by the magnitude that y..

Treatment of cotton fabrics : "Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the strength of the fabric. The breaking strength of untreated fabric is Normally distributed with mean 57..

They have to save each year to reach their goal : Assume that your parents wanted to have $160,000 saved for college by your 18th birthday and they started saving on your first birthday. They saved the same amount each year on your birthday and earned 11.5% per year on their investments. How much wo..

What will be annual payment if you sign this mortgage : A house you are looking to purchase costs $200,000. You have $29,000 in cash that you can use as a down payment on the house, but you need to borrow the rest of the purchase price. The bank is offering a 30-year mortgage that requries annual payments..

What considerations should be important in the decision : A company is trying to decide whether to buy a part from suppliers, produce the part while using manual assembly, or produce the part with an automated assembly system. The company expects an annual volume of 185,000 parts. What other considerations ..

What does oxytocin do to new mothers : What does oxytocin do to new mothers and people dating?

User Account

All Pages