What is the value of 8(15-4)/4^2-5
1 answer:
Answer: 0.5
Step-by-step explanation:
Android calculator accepts the above question via copy and paste, and gives 0.5
The point of this question is to try to discover whether or not you know what the expression means.
Rewriting it as (8(15-4)/(4×4)) - 5 would show that you know the meaning. You can check that by feeding it into the calculator as well.
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Answer:
0.9699 = 96.99% probability of a bulb lasting for at most 637 hours.
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:
Find the probability of a bulb lasting for at most 637 hours.
This is the pvalue of Z when X = 637. So
has a pvalue of 0.9699
0.9699 = 96.99% probability of a bulb lasting for at most 637 hours.