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Statistics (Sciences) -STA112/STA114 (Rachel Tara Farhat)
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Which of the following is a necessary condition for a probability distribution to be considered valid in statistics?
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A small bakery observes that the probability of receiving 0, 1, 2, or 3 online orders per hour is 0.1, 0.3, 0.4, and 0.2 respectively. Based on this data, what is the expected number of online orders the bakery should receive in an hour?
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In a normal distribution, what percentage of the data falls within one standard deviation of the mean (between μ − σ and μ + σ)?
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Which of the following scenarios does not fulfill the conditions required for a binomial experiment?
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The age of bank customers with large checking accounts is normally distributed with mean 44 and standard deviation 6. What is the probability that a customer is between 35 and 53 years old?
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The normal curve is symmetric and bell-shaped. What is always true about its mean, median, and mode?
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Which of the following formulas correctly represents the expected value (mean) for a discrete probability distribution of a random variable?
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A random variable that can take any value within a certain interval without gaps or interruptions is known as a:
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In statistical analysis, a variable that can take only specific, countable values—such as number of children in a family—is classified as which of the following?
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For a normal distribution with mean μ = 102 and standard deviation σ = 7.5, what is the Z-score for X = 115? (Values of Z-Table: P(Z < 1.5) = 0.9332, P(Z < -1.5) = 0.0668)
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