subject
Mathematics, 18.07.2020 18:01 pedrojsq271

An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 50 hours. How large a sample is need if we wish to be 95% confident that we will be within 12 hours of the true mean?

ansver
Answers: 2

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 16:00, ctyrector
Asap for seven months an ice creams vendor collects data showing the number of cones sold a day (c) and the degrees above 70 degrees f the vendor finds that there is a positive linear association between c and t that is the best modeled by this equation c=3.7t+98 which statement is true? the model predicts that the average number of cones sold in a day is 3.7 the model predicts that the average number of cones sold i a day is 98 a model predicts that for each additional degree that the high temperature is above 70 degres f the total of number of cones sold increases by 3.7 the model predicts for each additional degree that the high temperature is above 70 degrees f the total number of cones sold increasingly by 98
Answers: 3
image
Mathematics, 21.06.2019 19:20, cody665
1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?
Answers: 2
image
Mathematics, 21.06.2019 20:00, ghlin96
Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.
Answers: 1
image
Mathematics, 21.06.2019 20:30, BAJRY
Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?
Answers: 2
You know the right answer?
An electrical firm manufactures light bulbs that have a length of life that is approximately normall...

Questions in other subjects: