What is the NSTB?
What will be an ideal response?
The NSTB is the National Safety and Transportation Board.
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On 100 different days, a traffic engineer counts the number of cars that pass through a certain intersection between 5 P.M. and 5:05 P.M. The results are presented in the following table.
a. Let X be the number of cars passing through the intersection between 5 P.M. and 5:05 P.M. on a randomly chosen day. Someone suggests that for any positive integer x, the probability mass function of X is 
=(0.2)(0.8)x. Using this function, compute P(X=x) for values of x from 0 through 5 inclusive.
b. Someone else suggests that for any positive integer x, the probability mass function is 
=(0.4)(0.6)x. Using this function, compute P(X=x)for values of x from 0 through 5 inclusive.
c. Compare the results of parts (a) and (b) to the data in the table. Which probability mass function appears to be the better model? Explain.
d. Someone says that neither of the functions is a good model since neither one agrees with the data exactly. Is this right? Explain.
What is the lowest CN value that any #1D or #2D fuel formulated for highway use can be legally sold at?
A. 38 B. 40 C. 45 D. 47
The ____________________ indicates a ewe’s capability to produce more than one lamb at a time.
Fill in the blank(s) with the appropriate word(s).
To ensure a successful alignment, factor out indicator sag, eliminate soft foot, and pay close attention to ________
A) shim height B) thermal growth C) wedge thickness D) shaft slippage