Answer:
And using the normal standard distribution or excel we got:
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the weights of a population, and for this case we know the distribution for X is given by:
Where and
Since the dsitribution for x is normal then we know that the distribution for the sample mean is given by:
We want to find this probability:
And we can use the z score formula given by;
And if we find the z score for the limits given we got:
So we can calculate this probability like this:
And using the normal standard distribution or excel we got:
Answer:
−3 x −6
Step-by-step explanation:
8*40 = 320 * 2 = $640 for the 2 workers
640/2000 = 0.32
labor cost is 32% of the revenue
Answer:
Complete explanation is in the picture.
Step-by-step explanation:
hi
here is the trick
take new value , substract first value, then divise by first value and multiply by 100
so new value = 2.10
first value = 2.45
2.10 -2.45 = - 0.35
-0.35 / 2.45 = - 0.1428
-0.1428 * 100 = - 14.28 %
So decrease is of 14.3 % rounded to the nearest tenth.