24) The average qualifying speed for a championship NASCAR race is 145.65 mph an

Question

24) The average qualifying speed for a championship NASCAR race is 145.65 mph and the standard deviation is 9.45 mph. Only drivers who obtain z-scores greater than 1.2 will qualify for the race. If the speeds are normally distributed, what minimum speed must be clocked to compete for the trophy?

A. 146.9 mph
B. 174.8 mph
C. 157.0 mph
D. 155.2 mph



25) The Big Red Arcade and Pizza Palace caters to young teens and sells tokens to play arcade games for 25¢ each and slices of pizza for 50¢ each. The following table details the distribution of sales of pizza slices per customer and sales of arcade tokens per customer.



# Slices of Pizza 0 1 2 3 4 5
Probability 0.05 0.10 0.20 0.30 0.15 0.20






# Arcade Games 0 1 2 3 4 5
Probability 0.01 0.04 0.15 0.20 0.25 0.35



What is the total expected per-customer revenue for pizza slice sales and arcade token sales?

A. $6.69
B. $1.34
C. $2.42
D. $2.60



26) Trudy Jones recently completed her certification examination and learned that her z-score was –2.5. The examining board also informed her that a failure to pass would be all scores that were 1 or more standard deviations below the mean and that those with scores higher than 2 standard deviations above the mean would receive a special commendation award. Trudy can, therefore, conclude that she

A. needs more data to determine if she passed the exam
B. failed the exam
C. passed the exam, but no commendation award is forthcoming
D. passed the exam and will receive a special commendation award

Explanation / Answer

(24)C. 157.0 mph (25)A. $6.69 (26)B. failed the exam

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