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X/y = 2/3 / 6/7
= 2/3 * 7/6
= 14/18
= 7/9
Answer:
Probability is 0.04, which is unusual as it is less than 5%
Step-by-step explanation:
The event is considered to be unusual if the probability of occurrence of that event is less than 5% or 0.05.
We are given that mean and standard deviation are 108.43 and 36.68.
We have to find P(X>173).
P(X>173)=P((x-mean)/sd>(173-108.43)/36.98)
P(X>173)=P(Z>1.75)
P(X>173)=0.5-0.4599
P(X>173)=0.0401.
As the probability is 0.0401 which is less than 0.05, thus a bill with size $173 will be considered unusual.
