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What is the proper conclusion

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An 80-question multiple-choice engineering exam is graded as number correct minus 1/4 the number incorrect, so scores can range from -20 to +80. Suppose the standard deviation for one class results is reported to be -2.14. What is the proper conclusion?

  • Some students must have received negative scores.
  • Some students must have received positive scores.
  • An error was made in calculating the standard deviation.
  • At least half the class received negative scores.
  • More students received negative scores than positive scores.

Reference no: EM132483431

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