Step-by-step explanation:
letπ be the percentage of her savings
=40+85
=125
=125+π=100
=π=100-125
=π=75
Answer:
We are 99% confident that the true mean of electricity comsumption is between (15.6 and 15.8) kWh
Step-by-step explanation:
Information provided
represent the sample mean for the usage of electricity
population mean (variable of interest)
represent the population standard deviation
n=1731 represent the sample size
Confidence interval
The confidence interval for the mean is given by the following formula if we know the population deviation:
(1)
The Confidence level provided is 0.99 or 95%, the value of significance is 
and 
, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that 
And replacing we got:
We are 99% confident that the true mean of electricity comsumption is between (15.6 and 15.8) kWh
Answer:
Greatest common divisor (P,Q) × Least common multiple (P,Q) = PQ
Step-by-step explanation:
Given: Two numbers are P and Q
To prove: product of their greatest common divisor and their least common multiple is equal to PQ
Solution:
Consider the following relation:
Greatest common divisor (P,Q) × Least common multiple (P,Q) = Product of numbers P and Q
Therefore,
Greatest common divisor (P,Q) × Least common multiple (P,Q) = PQ
Answer:
12
Step-by-step explanation:
In four acres there are 3 gardens so you just have to multiply 4x3=12
