How to practice concept:standard-deviation

Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.

Questions 1–2 of 2. Imported answers require independent review unless marked reviewed.

Topic practice 2 questionsPage 1 of 1

Question 47

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CENAT2 marksNeeds review
The age (in years) of a population is normally distributed with a mean of 36 and standard deviation of 12. The height (in cm) of the same population is also normally distributed with a mean of 160 and standard deviation of 10.
If the probability of age greater than 50 years is equal to the probability of height greater than h, the value of h (in cm) is ______ (rounded off to two decimal places).

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Question 51

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CENAT2 marksNeeds review
Consider a discrete random variable

whose probabilities are given below. The standard deviation of the random variable is _____ (round off to one decimal place).


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