Answer:
x/y = 3/8
Step-by-step explanation:
y = 4/5 = 8/10, so ...
x/y = (3/10)/(8/10) = 3/8
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One way to divide fractions is to make them have the same denominator. Then their ratio is the ratio of their numerators.
Answer:
Well it could be 25 and 69 or 30 and 65
Step-by-step explanation:
Not sure if I answered right but hope I helped!
Answer and Step-by-step explanation:
Workings and solutions to a, b, & c can be viewed in the snapshot below:
Answer:
Therefore, the probability that at least half of them need to wait more than 10 minutes is <em>0.0031</em>.
Step-by-step explanation:
The formula for the probability of an exponential distribution is:
P(x < b) = 1 - e^(b/3)
Using the complement rule, we can determine the probability of a customer having to wait more than 10 minutes, by:
p = P(x > 10)
= 1 - P(x < 10)
= 1 - (1 - e^(-10/10) )
= e⁻¹
= 0.3679
The z-score is the difference in sample size and the population mean, divided by the standard deviation:
z = (p' - p) / √[p(1 - p) / n]
= (0.5 - 0.3679) / √[0.3679(1 - 0.3679) / 100)]
= 2.7393
Therefore, using the probability table, you find that the corresponding probability is:
P(p' ≥ 0.5) = P(z > 2.7393)
<em>P(p' ≥ 0.5) = 0.0031</em>
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Therefore, the probability that at least half of them need to wait more than 10 minutes is <em>0.0031</em>.
