Answer:
Step-by-step explanation:
(x + 4)/(x+4)(x-3)
= 1/(x-3)
solution is option 4
Answer:
A sample size of 128 is needed.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
In which is the standard deviation of the population(square root of the variance) and n is the size of the sample.
How large should a sample be if the margin of error is 1 minute for a 93% confidence interval
We need a sample size of n, which is found when . We have that . So
Rounding up
A sample size of 128 is needed.
-15,-5,-2,1,3,8 it's pretty simple
Answer:
The probability that the next person will purchase no more than one costume .
Step-by-step explanation:
The data for a single day is s follows:
- 236 visitors purchased no costume.
- 202 visitors purchased exactly one costume.
- 40 visitors purchased more than one costume.
The total number of customers is, <em>N</em> = 236 + 202 + 40 = 478.
Let <em>X</em> denote the number of costumes purchased by the next person.
Compute the probability that the next person will purchase no more than one costume as follows:
Thus, the probability that the next person will purchase no more than one costume .