Answer:
(A) 0.0013
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:
The probability that telephone call selected a random will last more than 15.5 min is most nearly
This is 1 subtracted by the pvalue of Z when X = 15.5.
So
has a pvalue of 0.9987
1 - 0.9987 = 0.0013
So the correct answer is:
(A) 0.0013
Answer:
a
Step-by-step explanation:
3x tables
vhhvffffhhgfgfccf
Answer:
13.5
Step-by-step explanation:
That is the mean between 6 & 21
Answer:
x >
Step-by-step explanation:
Given
6 - x < - 9 ( subtract 6 from both sides )
- x < - 15 ( multiply both sides by 3 )
- 2x < - 45
Divide both sides by - 2, reversing the inequality symbol as a consequence of dividing by a negative quantity.
x >
Answer:
no
Step-by-step explanation: