Question 2 (1.5 points) At a certain concert, 33 % of the audience was under 20

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Question 2 (1.5 points) At a certain concert, 33 % of the audience was under 20 years old. A random sample of n 193 members of the audience was selected. Find the value of the mean of the distribution of sample proportions. Wrtie only a number as your answer. Do not write as a percentage. Your Answer: Question 3 (1.5 points) According to one pollster, 44 % of people are afraid of flying. Suppose that a sample of size 30 is drawn. Find the value of the standard deviation of the distribution of sample proportions. Write only a number as your answer. Round to two decimal places (for example: 8.21) Your Answer: Question 4 (2 points) It has been reported that 48% of teenagers play video games on their phones. A random sample of 60 teenages is drawn. Find the probability that the proportion of teenagers in the sample who play videos games on their phone is less than 0.488 Write only a number as your answer. Round to 4 decimal places (for example 0.3748). Do not write as a percentage Your Answer: Question 5 (2 points) 74% of freshmen entering public high schools in 2006 graduated with their class in 2010. A random sample of 81 freshmen is selected. Find the probability that the proportion of students who graduated is greater than 0.743 Write only a number as your answer. Round to 4 decimal places (for example 0.1048). Do not write as a percentage. Your Answer:

Explanation / Answer

Question 2 (1.5 points) At a certain concert, 33 % of the audience was under 20 years old. A random sample of n 193 members of the audience was selected. Find the value of the mean of the distribution of sample proportions. Wrtie only a number as your answer. Do not write as a percentage. Your Answer: Question 3 (1.5 points) According to one pollster, 44 % of people are afraid of flying. Suppose that a sample of size 30 is drawn. Find the value of the standard deviation of the distribution of sample proportions. Write only a number as your answer. Round to two decimal places (for example: 8.21) Your Answer: Question 4 (2 points) It has been reported that 48% of teenagers play video games on their phones. A random sample of 60 teenages is drawn. Find the probability that the proportion of teenagers in the sample who play videos games on their phone is less than 0.488 Write only a number as your answer. Round to 4 decimal places (for example 0.3748). Do not write as a percentage Your Answer: Question 5 (2 points) 74% of freshmen entering public high schools in 2006 graduated with their class in 2010. A random sample of 81 freshmen is selected. Find the probability that the proportion of students who graduated is greater than 0.743 Write only a number as your answer. Round to 4 decimal places (for example 0.1048). Do not write as a percentage. Your Answer:

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