(07.05)
2 answers:
Answer:
b. -2
Step-by-step explanation:
3n + 2 ( n + 2 ) = 9n + 12
[To simplify, multiply 2 with n and 2]
3n + 2n + 4 = 9n + 12
5n + 4 = 9n + 12
[Add 2n and 3n]
5n + 4 - 9n = 12
[Sign of 9n would change when it's moved from one side of the = to the other]
5n - 9n = 12 - 4
[Similarly, sign of 4 would change from + to -]
- 4n = 8
n = 8/-4
n = -2
Hope this helps :D
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Answer:
69.15% probability that a randomly selected customer spends less than $105 at this store
Step-by-step explanation:
Problems of normally distributed samples are solved using the z-score formula.
In a set with mean and standard deviation
, the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this problem, we have that:
What is the probability that a randomly selected customer spends less than $105 at this store?
This is the pvalue of Z when X = 105. So
has a pvalue of 0.6915
69.15% probability that a randomly selected customer spends less than $105 at this store
The graph intersects the x-axis twice. It intersects at the points of (-1,0) and (2.5,0). The graph is attached.
