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Answer:
The percentage decrease in TV price after five years is 6.89
Step-by-step explanation:
Given as :
The cost of TV five years ago = $ 2400
The present cost of TV = $ 1680
Let The decrease percentage in five years = x
So, The cost of TV after T year = Present cost ×
Or, $ 1680 = $ 2400 ×
Or, 0.7 =
Or, = 1 -
Or, 0.9311 = 1 -
Or, = 1 - 0.9311
∴, = 0.0689
I.e x = 0.0689 × 100 = 6.89
Hence The percentage decrease in TV price after five years is 6.89 Answer
Answer:
a. 0.048
Step-by-step explanation:
Problems of normally distributed samples can be 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:
P(X > 20) is 1 subtracted by the pvalue of Z when X = 20. So
has a pvalue of 0.952.
So P(X>20) = 1 - 0.952 = 0.048.
The correct answer is:
a. 0.048