Question

1. a student conducts a survey on the favorite ice cream flavors of students at central middle school. the table shows the results.

	7th graders	8th graders	total
strawberry	81	53	134
chocolate	120	135	255
total	248	252	500

which statement is true?
a over 50% of 7th graders prefer chocolate ice cream.
b over 50% of 7th graders prefer strawberry ice cream.
c over 50% of 8th graders prefer chocolate ice cream.
d over 50% of 8th graders prefer strawberry ice cream.

(another question: which statement is true?
a the initial value of the function is 11.2.
b the initial value of the function is 8.
c the initial value of the function is 6.
d the initial value of the function is −2.7.)

Explanation:

Step1: Analyze 7th graders' chocolate preference

Total 7th graders: 248. Chocolate preference: 120. Calculate percentage: $\frac{120}{248} \approx 48.39\%$ (less than 50%). So A is false.

Step2: Analyze 7th graders' strawberry preference

Strawberry preference: 81. Percentage: $\frac{81}{248} \approx 32.66\%$ (less than 50%). So B is false.

Step3: Analyze 8th graders' chocolate preference

Total 8th graders: 252. Chocolate preference: 135. Percentage: $\frac{135}{252} \approx 53.57\%$ (over 50%). So C is true.

Step4: Analyze 8th graders' strawberry preference

Strawberry preference: 53. Percentage: $\frac{53}{252} \approx 21.03\%$ (less than 50%). So D is false.

Answer:

C. Over 50% of 8th graders prefer chocolate ice cream.