Answer:
1509
Step-by-step explanation:
We know that, formula for number of samples is,
When nothing is given, we take and we know that .
SE = 0.03 (the true proportion should remain withing 3%)
Putting the values we get,
Therefore, the sample required to estimate the true proportion to within 3 percentage points is 1509.
Answer:
1700
300
Step-by-step explanation:
Let X be the investment at 7%,
Then 2000-X is invested at 4%
0.07X + 0.04(2000 - X) = 131
0.07X - 0.04X = 131 - 80
0.03X = 51
X = 1700
2000 - X = 300
Answer:
yes
Step-by-step explanation:
Answer:
x=61.71428 or 61 5/7
Step-by-step explanation:
We can use a ratio to solve
7 pieces 12 pieces
----------------- = ---------------
36 seconds x seconds
Using cross products
7x = 36*12
7x = 432
Divide by 7
7x/7 = 432/7
61 5/7
x=61.71428