Answer:
The option is D
Step-by-step explanation:
Given
put we get
Similarly,
put we get
put we get
Answer:
hmmm sorry I wish I could help man or girl. just try your best you'll get there I promise you that.
Step-by-step explanation:
Answer:
D is correct.
Step-by-step explanation:
Given:
To find:
As we know,
This is parametric equation. Differentiate both function separately and substitute into formula.
and
Substitute into derivative
For double derivative differentiate w.r.t x
Hence, The value of
Answer:
24.51% probability it will last longer than 7 years
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:
If you randomly purchase one item, what is the probability it will last longer than 7 years
This is 1 subtracted by the pvalue of Z when X = 7. So
has a pvalue of 0.7549
1 - 0.7549 = 0.2451
24.51% probability it will last longer than 7 years
25% = 0.25
70*0.25 = 17.50
Subtract 17.50 from 70
70-17.50 = $52.50