Question

The average time it takes a loaf of bread to rise is 2.4 hours with a standard deviation of 0.6! What is the z-score of a loaf that takes 3.6 hours to rise

Answer 1

@Why_Study_Alone

Answer 2

by definition, such quantity, is given by the subsequent formula:
\[z = \frac{{3.6 - 2.4}}{{0.6}} = ...?\]

Answer 3

i get 2

Answer 4

that's right!

Answer 5

Consider the lengths of alligators to be { 18.7, 12.3, 18.6, 16.4, 15.7, 18.3, 15.8, 14.9, 17.6, 16.4, 16.7, 17.8, 16.2, 13.8, 15.2, 14.7, 13.2, 15.8, 14.6, 16.6, 16.2, 18.1, 17.5, 17.3} According to the Empirical Rule, 68% of the data should fall between what two numbers?

A. 12.78 and 16.4
B. 13 and 16
C. 14.5 and 17.9
D. 15.7 and 16.3

Answer 6

thats the hard one

Answer 7

I'm thinking...

Answer 8

yes its quite annoying

Answer 9

I know we have to find Standard deviation first

Answer 10

here is the step by step procedure:
#1 compute the mean value \(\overline{X}\);
#2 compute the standard deviation \(\sigma\):
the requested interval (68%) is: \[\overline X - \sigma \leqslant x \leqslant \overline X + \sigma \]

Answer 11

ok then thats very interesting

Answer 12

of course, the standard deviation \(\sigma\), is the standard deviation of the mean

Answer 13

it would be C

Answer 14

I think

Answer 15

I don't know, since I didn't such computations

Answer 16

17.87726

Answer 17

14.4897

Answer 18

did you use the standard deviation of the mean, please?

Answer 19

yes

Answer 20

like this: compute

xbar - SD

and

xbar + SD

Answer 21

in that case, I think that your answer is correct!

Answer 22

please remember that the standard deviation of the mean, is the standard deviation from your data \(\sigma\) divided by \(\sqrt N\), where \(N=24\) is the number of your data

Answer 23

yes I will but hey

Answer 24

Awesome! Thank you for your help it means a lot STAY COOL! POUND IT BRUHH

Answer 25

:)