#6

Identify the lower classlimits, upper classlimits, classwidth, classmidpoints, and class boundaries for the given frequency distribution. Also identify the number of individuals included in the summary.

Blood Platelet Count of Females(1000 cells/L) Frequency

100-199 26

200-299 92

300-399 29

400-499 1

500-599 3

Identify the lower class limits.

________, ________, _________, _________, _________.

(Type integers or decimals. Do not round. Use ascendingorder.)

Identify the upper class limits.

________, ________, ________, ________, ________.

(Type integers or decimals. Do not round. Use ascendingorder.)

Identify the class width.

________.

(Type an integer or a decimal. Do notround.)

Identify the class midpoints.

_______, ______, ______, _______, ________.

(Type integers or decimals. Do not round. Use ascendingorder.)

Identify the class boundaries.

________, ________, ________, ________, ________, ________.

(Type integers or decimals. Do not round. Use ascendingorder.)

Identify the number of individuals included in the summary.

________

(Type a wholenumber.)

#7

Among fatal plane crashes that occurred during the past 70 years, 405 were due to piloterror, 70 were due to other humanerror, 103 were due toweather, 296 were due to mechanicalproblems, and 217 were due to sabotage.

Construct the relative frequency distribution. What is the most serious threat to aviationsafety, and can anything be done aboutit?

Complete the relative frequency distribution below.

Cause Relative Frequency

Pilot error ________%

Other human error ________%

Weather _______%

Mechanical problems _______%

Sabotage ________%

(Round to one decimal place asneeded.)

What is the most serious threat to aviationsafety, and can anything be done aboutit?

A.

Weatheris the most serious threat to aviation safety. Weather monitoring systems could be improved.

B.

Mechanicalproblemsare the most serious threat to aviation safety. New planes could be better engineered.

C.

Sabotageis the most serious threat to aviation safety. Airport security could be increased.

D.

Piloterroris the most serious threat to aviation safety. Pilots could be better trained.