Question

find and interpret the marginal frequencies.
cell phone minutes
limited unlimited
text plan limited 78 0
unlimited 175 15
□ people have limited cellphone texting plans.
□ people have unlimited cellphone texting plans.
□ people have limited cell phone minutes.
□ people have unlimited cell phone minutes.

Explanation:

Step1: Calculate limited texting plans

Sum the values in the "Limited" row of the text plan.
$78 + 0 = 78$

Step2: Calculate unlimited texting plans

Sum the values in the "Unlimited" row of the text plan.
$175 + 15 = 190$

Step3: Calculate limited cell phone minutes

Sum the values in the "Limited" column of cell phone minutes.
$78 + 175 = 253$

Step4: Calculate unlimited cell phone minutes

Sum the values in the "Unlimited" column of cell phone minutes.
$0 + 15 = 15$

Answer:

78 people have limited cellphone texting plans.
190 people have unlimited cellphone texting plans.
253 people have limited cell phone minutes.
15 people have unlimited cell phone minutes.