Answer:
- P(x < 84) = 0.3085 or approximately 31%
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Hello to you from Brainly team!
Given
- Mean grade μ = 86,
- Standard deviation σ = 4,
- Grade limit x = 84.
To find
- Probability of that a randomly selected grade is less than 84 or P(x < 84).
Solution
Find z-score using relevant equation:
Substitute values and calculate:
Using the z-score table find the corresponding P- value.
- P(x < 84) = 0.30854 or approximately 31%
