Hey mate!
You stuck?
128 is 74% of 172.972973 or 173 rounded
173x .74= 128.02 or 128 rounded
Hope this helps!
Answer:
22.467
Step-by-step explanation:
Hello,
You just have to do the computation in XL or using a calculator, and round each number to the nearest hundred
x sqrt(x)
1 1
2 1.414
3 1.732
4 2
5 2.236
6 2.449
7 2.646
8 2.828
9 3
10 3.162
and do the sum which is 22.467
Hope this helps.
Do not hesitate if you need further explanation.
Thank you
Note: 399 dollar to pound = 263.34 pound
Solution: 15% off 399 is equal to (15 x 15) / 100 = 59.85. So if you buy an item at $399 with 15% discounts, you will pay $339.15 and get 59.85 cashback rewards. hope this helps you
Answer:
no
Step-by-step explanation:
Answer:
The number of observations required is closest to 609 ⇒ b
Step-by-step explanation:
The formula of the sample size is n = [( . σ)/E]² , where
- σ is the standard deviation
- E is the margin of error
- is the z-score, where 1 - α = confidence interval
∵ We want 90% confidence interval for the average amount
spent on books by freshmen in their first year at a major
university
∴ 1 - α = 90%
∵ 90% = 90 ÷ 100 = 0.90
∴ 1 - α = 0.90
- Subtract 1 from both sides
∴ - α = -0.10
- Divide both sides by -1
∴ α = 0.10
- Find the value of
∴ = = 0.05
- Look to the normal distribution table to find z-score for this
value with opposite sign
∴ = 1.645
∵ The interval is to have a margin of error of $2
∴ E = 2
∵ We estimate that the standard deviation of the amount spent
will be close to $30
∴ σ = 30
- Substitute these values in the formula above
∴ n = [(1.645)(30) ÷ 2]²
∴ n = 608.855
- Round it to the whole number
∴ n = 609
The number of observations required is closest to 609