Express each claim in symbolic form.

a. at least half the students at this school carpool to campus/

b. The average number of sick days taken annually by individual faculty members at this school is 4.

c. The mean annual rainfall for this country is no more than 42"

d. More than 25% of the injuries caused by fireworks occur to hands.

e. The standard deviation of the widths of ball bearings produces by new machine is at most 0.01"

f. 89% of people using Sleep Number mattress experience improved sleep quality.