Fredrick is single and lives alone. He paid more than half of the cost of maintaining a home for his father for the entire year.
1 answer:
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Answer:
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- <u><em>4.75% of the candidates takes more than two hours to learn the computer system.</em></u>
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Explanation:
The relevant information to solve the problem is:
- 1. <em>The time it takes to learn follows a Normal distribution </em>
- 2.<em> The mean is 90 minutes</em>
- 3. T<em>he standard deviation is 18 minutes</em>
- 4. <em>The question is What proportion of candidates takes more than two hours to learn the computer system?</em>
Then, you shall calculate the Z-score and use a standard distribution table to look up the Z-score and the corresponding probability.
Repeating myself from a recent answer, "there are two types of standard distribution tables: tables that show values that represent the AREA to the LEFT of the Z-score, and tables that show values that represent the AREA to the RIGHT of the Z-score".
<u>1. First, calculate the Z-score:</u>
<u>2. Use the table that represents the area to the right of the mean to find the ratio of typists that have a Z-score greater than 1.67.</u>
Therefore, 4.75% of the candidates takes more than two hours to learn the computer system.