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# calculus help 2

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some calculus problems im having trouble with thx

Mar 30, 2019

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Zscore -0.5   standard deviations from mean is   -0.5 (1.8) + 12.5 = 11.25 ft

Look at your NEGATIVE z-score table to find .20    (1 - 80% = .20)       and find approximately  -.84 standard deviations below the mean = .2005  (which means 1-.2005 are ABOVE this).....

55 gm - .84 x 4.2   = 51.47 gm    80% are greater than this

Mar 30, 2019
edited by ElectricPavlov  Mar 30, 2019
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Third one:  Look at your POSITIVE z-score table     25 ounces is   1oz/1.3oz/S.D =  0.7692 ~~.77 Standard deviations ABOVE the mean. This corresponds to

.7794  z-score       SO  77.94 percent are LESS than this      77.94% x 1200 boxes =  935.28  ~~  935 boxes are 25 oz or less

Mar 30, 2019
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Your question is statistics. It has absolutely nothing to do with calculus.

Mar 30, 2019
edited by Melody  Mar 30, 2019
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I apologize. I thought this site may be able to help. I did not intend to offend.

Guest Mar 30, 2019
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You didn't offend. I am just stating that your title is incorrect.

It is better if titles reflect the content of the question.

And the content of this questions is

Statistics    OR    Normal distributions     OR       Using Z scores.

Personally I think   'Using Z scores with normal distributions'    would be a very good title.

Melody  Mar 30, 2019
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i wasn't the one that replied but ill take note on what you said

Dannymay  Mar 30, 2019