According to a recent FCC survey, one in four cell phone users has experienced bill shock from unexpectedly high cell phone bills. A sample of 200 cell phone users was collected. Required:
a. What is the probability that more than 20% of cell phone users in the sample have experienced bill shock?
b. What is the standard error of the proportion?

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66answer:

step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3