Mathematics, 14.10.2019 01:30, lnbrown5633

"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 51.8 pounds and standard deviation 2.9 pounds. the same type of fabric after treatment has normally distributed breaking strength with mean 20.9 pounds and standard deviation 1.8 pounds. a clothing manufacturer tests 4 specimens of each fabric. all 8 strength measurements are independent. (round your answers to four decimal places.)
(a) what is the probability that the mean breaking strength of the 4 untreated specimens exceeds 50 pounds?

(b) what is the probability that the mean breaking strength of the 4 untreated specimens is at least 25 pounds greater than the mean strength of the 4 treated specimens?

Answers: 2

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 16:00, pringleosmond

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Answers: 3

continue

Mathematics, 21.06.2019 19:30, indiaseel2744

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)

Answers: 1

continue

Mathematics, 21.06.2019 20:00, aliahauyon20

The rectangle shown has a perimeter of 108 cm and the given area. its length is 6 more than five times its width. write and solve a system of equations to find the dimensions of the rectangle.

Answers: 3

continue

Mathematics, 21.06.2019 23:30, liaholmes8

Walking at a constant rate of 8 kilometers per hour, juan can cross a bridge in 6 minutes. what is the length of the bridge in meters?

Answers: 1

continue

Do you know the correct answer?

"durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. un...