A store that buys and sells used video games buys a game at a cost of $9 and sells it at a selling price of $13. Find the mark
2 answers:
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Answer:
0.15866.
Step-by-step explanation:
We have been given that on average, electricians earn approximately μ= $54,000 per year in the united states. Assume that the distribution for electricians' yearly earnings is normally distributed and that the standard deviation is σ= $12,000. We are asked to find the probability that the sample mean is greater than $66,000.
First of all, we will find the z-score corresponding to 66,000 using z-score formula.
Now, we need to find the probability that z-score is greater than 1 that is .
Upon using formula , we will get:
Upon using normal distribution table, we will get:
Therefore, the probability that the sample mean is greater than $66,000 would be 0.15866 or approximately .
Answer:
Step-by-step explanation:
Start by "taking out" the perfect squares. 25 and 9 are perfect squares (and pretty common ones).
The square root of 25 is 5 and the square root of 9 is 3. Therefore you can take out a 5 and 3 from the radical. Multiply the numbers you take out together.
5 * 3 = 15
The number outside of the radical sign will be a 15, and x is left over inside the radical. The final answer is .