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Mixed Probability

Authored by Barbara White

Mathematics

10th Grade - University

Mixed Probability
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16 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The average waist size for teenage males is 29 inches with a standard deviation of 1.4 inches. If waist sizes are normally distributed, what is the probability of teenagers who will have waist sizes greater than 31 inches?

0.9236

0.1050

0.1600

0.0764

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees. What is the probability that a randomly selected day will have a temperature of more than 17 degrees?

0.0062

0.0766

0.9234

0.9938

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Alex's baby was in the 96th percentile for height when she was born. Given σ = 2 inches, and µ = 20 inches, how long was Alex's baby when she was born?

23.5 inches

20.15 inches

17.45 inches

37 inches

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A ball manufacturer claims that only 15% of his balls are defective. If Ali has 6 of these balls to play with at a ball game, find the probability at most 4 balls will be defective.

0.9941

0.0059

0.9996

0.9527

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Snobby University accepts only those graduate students who score in the top 5% of the GRE (Graduate Requirements Exam).


Given that µ = 151.3 and σ = 8.7, what is the lowest score you can get and still be accepted to SU? Round to the nearest whole number.

165

166

170

162

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The marks obtained by the students are normally distributed with mean 61 marks and variance 100 marks. Find the probability of the students obtain at least 85 marks.

0.4207

0.0082

0.1112

0.9918

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Salmi expected to receive 4 emails in a week. Find the probability of receiving 8 emails for the next 2 weeks.

0.0511

0.0297

0.5470

0.1395

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