Answer: 20
Step-by-step explanation:
Formula to find the minimum sample size(n) when prior population standard deviation
is known.
, where E = Margin of error ,
= Critical z-value for c confidence interval.
Given : E = 225 g ,
g
Critical z value for 90% confidence = 1.645
Now, 


Hence, the required minimum sample size = 20
Given
we are given a function

over the interval [0,5].
Required
we need to find formula for Riemann sum and calculate area under the curve over [0,5].
Explanation
If we divide interval [a,b] into n equal intervals, then each subinterval has width

and the endpoints are given by

For k=0 and k=n, we get

Each rectangle has width and height as

we sum the areas of all rectangles then take the limit n tends to infinity to get area under the curve:

Here




Now Area=

So the required area is 66.6 sq units.
Answer:

Step-by-step explanation:
Simplifica la expresión
Answer: 30!
Step-by-step explanation: