TombRaider167
18.09.2019 •
Business
The monthly income of 5,000 workers at the microsoft plant are distributed normally. suppose the mean monthly income is $1,250 and the standard deviation is $250. a) how many workers earn more than $1500 per month? b) how many workers earn less than $750 per month? c) what percentage of the workers earn between $750 and $1500 per month? d) what percentage of the workers earn less than $1750 per month?
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Ответ:
a) 15.86
b) 2.28%
c) 81.86%
d) 97.72%
Explanation:
we normalize to N(1;0)
Z = (X -u)/o
being u the mean
and o the standard deviation
a)
Z (1 - (1500 - 1250)/250) = 0.158655254
b)
Z (750-1250)/250 = 0.022750132
c)
Z ((1500 - 1250)/250) - Z (750) = 0.841344746 - 0.022750132 =
0.818594614
d)
Z (1750 - 1500)/250 = 0.977249868
Ответ:
Más de 7 pH.
Explanation:
Antiácidos son bases cual tienen un pH más de 7.