- Cindy spent $6 on her meal. She spent $4
2 answers:
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Answer:
y=3
x=2
Step-by-step explanation:
i have answered it....feel free to ask if u don't get it
Answer:
A - Solomon read of the book each night.
B - The total number of pages in the book are 105.
Step-by-step explanation:
We are given that,
Solomon has read of a book.
So, of the book is left to be read.
Ques A: We have that,
In 5 nights, Solomon read of the book.
So, on 1 night, he will read, =
of the book.
Thus, Solomon read of the book each night.
Ques B: Let the total pages of the book = x.
Solomon reads 14 pages in 1 night. So, he reads, 14 × 5 = 70 pages in 5 nights.
Since, these 70 pages represent the of the book, he read in 5 nights.
So, of the total pages = 70
i.e.
i.e. x= 105
Hence, the total number of pages in the book are 105.
Answer:
Step-by-step explanation:
The empirical rule, also referred to as "the three-sigma rule or 68-95-99.7 rule, is a statistical rule which states that for a normal distribution, almost all data falls within three standard deviations (denoted by σ) of the mean (denoted by µ)". The empirical rule shows that 68% falls within the first standard deviation (µ ± σ), 95% within the first two standard deviations (µ ± 2σ), and 99.7% within the first three standard deviations (µ ± 3σ).
And on this case since we are within 3 deviations (because we have 99.7% of the data between 568 and 1066hours), the result obtained using the z score agrees with the empirical rule.
So on this case we can find the standard deviation on this ways:
(1)
(2)
If we subtract conditions (2) and (1) we got: