In an attempt to save money, the lunchroom staff sent out student questionnaires to see which foods students preferred. once they knew students preferences, the lunch room staff would prepare the most popular foods, thereby reducing waste. based on the student questionnaire data, what inference can the lunchroom staff make?

b) pizza is the favorite food of about one-third the students.
c) all students would prefer to eat pizza over any other food.
d) students have no preferences regarding the food they eat for lunch.

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

Using data from seismic waves, geologists have learned that earth’s interior is made up of several