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When Sophie goes bowling, her scores are normally distributed with a mean of 110110 and a standard deviation of 1010. What percentage of the games that Sophie bowls does she score higher than 129129, to the nearest tenth?\newline

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Q. When Sophie goes bowling, her scores are normally distributed with a mean of 110110 and a standard deviation of 1010. What percentage of the games that Sophie bowls does she score higher than 129129, to the nearest tenth?\newline
  1. Identify mean and standard deviation: Identify the mean (μ\mu) and standard deviation (σ\sigma) of Sophie's bowling scores.\newlineThe mean (μ\mu) is given as 110110, and the standard deviation (σ\sigma) is given as 1010.
  2. Calculate z-score for Sophie's score: Calculate the z-score for Sophie's score of 129129. The z-score formula is z=(Xμ)/σz = (X - \mu) / \sigma, where XX is the score in question. For Sophie's score of 129129, the z-score would be z=(129110)/10z = (129 - 110) / 10.
  3. Perform z-score calculation: Perform the calculation for the z-score.\newlinez=12911010z = \frac{129 - 110}{10}\newlinez=1910z = \frac{19}{10}\newlinez=1.9z = 1.9
  4. Find probability using standard normal distribution: Use a standard normal distribution table or calculator to find the probability of scoring less than a z-score of 1.91.9.\newlineThe table or calculator will give us the area to the left of the z-score.
  5. Subtract area to find higher scores percentage: Subtract the area found in Step 44 from 11 to find the area to the right of the z-score, which represents the percentage of games Sophie scores higher than 129129. If the area to the left of z=1.9z = 1.9 is PP, then the area to the right is 1P1 - P.
  6. Look up area in z-table: Look up the area to the left of z=1.9z = 1.9 in the z-table or use a calculator to find PP. Assuming a standard normal distribution, the area to the left of z=1.9z = 1.9 is approximately 0.97130.9713.
  7. Calculate area for higher scores: Calculate the area to the right of z=1.9z = 1.9, which is the percentage of games Sophie scores higher than 129129.\newlineArea to the right = 10.97131 - 0.9713\newlineArea to the right 0.0287\approx 0.0287
  8. Convert area to percentage: Convert the area to the right into a percentage.\newlinePercentage = 0.0287×1000.0287 \times 100\newlinePercentage 2.87%\approx 2.87\%
  9. Round percentage: Round the percentage to the nearest tenth.\newlineRounded percentage = 2.9%2.9\%

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