Item has been reduced by 80% what is the price of the item now?
1 answer:
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Answer:
Step-by-step explanation:
Given that
Population mean
std deviation = 12
sample size n =36
Sample mean =
(Two tailed test)
Mean difference = 7
Std error =
Since population std dev is known and n>30 we use Z test
Z statistic =
p value <0.001
Since p value is <0.01, at 1% significance level, we reject H0.
There is significant difference between sample mean and population mean.
let's call G the intersection point of EF & BC.
according to the thales' theorem:
and EF= EG+GF=EG+3
length of the altitude of △AED=EF
EF=EG+GF=1.5+3=4.5