The answer to the question is D 39
A) The population and sample mean are always the same ... in this case, it is 20.6 minutes.
<span>b) First convert the data to z-values: </span>
<span>P(X<18) = P(z < (18-20.6)/8.4) = P(z< -0.3095) </span>
<span>Now, using a Standard Normal table, look up z= -0.3095 </span>
<span>P(X<18) = 0.3785 </span>
<span>Hope that helps</span>
Answer:
86% probability. hope this helps :)
Step-by-step explanation:
Answer:
Hey, I got 20 and I asked my friend to work it and he got 20 too.
Step-by-step explanation: