48
the answer is 48 i’m just writing this because it says i have to write something 20 words long
To find the circumference the formula is C=2(3.14)r
So C = 2(3.14)(6)
C= 37.69 or 37.7
Dang this is hard. I think it is x=22 but I could be wrong. :o
Answer:
0.8413 = 84.13% probability of a bulb lasting for at most 605 hours.
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean and standard deviation , the z-score 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 p-value, we get the probability that the value of the measure is greater than X.
The standard deviation of the lifetime is 15 hours and the mean lifetime of a bulb is 590 hours.
This means that
Find the probability of a bulb lasting for at most 605 hours.
This is the pvalue of Z when X = 605. So
has a pvalue of 0.8413
0.8413 = 84.13% probability of a bulb lasting for at most 605 hours.
Answer: y=7
Step-by-step explanation:You have to divide 434 by 62 to get y. Then you can double check by multiplying 7 times 62 which equals 434.