21. A data professional working for a smartphone manufacturer is analyzing sample data on the weight of a specific smartphone. The data follows a normal distribution, with a mean weight of 150g and a standard deviation of 10g. According to the empirical rule, approximately what percentage of the data values lie between 140g and 160g?

  • 99.7%
  • 50%
  • 95%
  • 68%

22. If a data value has a z-score of 0, what does the value equal?

  • The mode
  • The mean
  • The median
  • The standard deviation

23. A data professional is analyzing sales data for a retail store. The data follows a normal distribution. What Python function can they use to compute z-scores for the data?

  • median.zscore()
  • mean.zscore()
  • stats.zscore()
  • normal.zscore()

24. If all outcomes of an event are equally likely, how is its probability calculated?

  • Divide the total number of possible outcomes by the number of desired outcomes.
  • Divide the total number of certain outcomes by the number of possible outcomes.
  • Divide the number of desired outcomes by the total number of possible outcomes.
  • Divide the total number of possible outcomes by the number of certain outcomes.

25. A coin is tossed twice. To calculate the probability of getting two heads in a row, which of the following equations should be used?

  • ½ – ½
  • ½ ÷ ½
  • ½ + ½
  • ½ * ½

26. Which of the following events are mutually exclusive? Select all that apply.

  • Getting a 4 on a first die roll and a 6 on a second die roll
  • Getting heads and tails on the same coin toss
  • Getting heads on a first coin toss and tails on a second coin toss
  • Getting a 4 and a 6 on the same die roll

27. Which of the following are examples of discrete random variables? Select all that apply.

  • The number of radios produced in a factory each day
  • The time it takes to drive from one city to another city
  • The number of rooms in a hotel
  • The length of an airplane

28. The Poisson distribution can model which of the following kinds of data? Select all that apply.

  • The number of visitors per day on a website
  • The number of heads in 10 fair coin tosses
  • The number of customers per week at a retail store
  • The number of calls per hour at a call center

Shuffle Q/A 3

29. A data professional working for a smartphone manufacturer is analyzing sample data on the weight of a specific smartphone. The data follows a normal distribution, with a mean weight of 150g and a standard deviation of 10g. What data value lies 3 standard deviations below the mean?

  • 130g
  • 160g
  • 180g
  • 120g

30. The mean and the standard deviation of a standard normal distribution always equal what values?

  • Mean = 1; standard deviation = 2
  • Mean = 2; standard deviation = 1
  • Mean = 0; standard deviation = 2
  • Mean = 0; standard deviation = 1
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