1.Assume that the time a student stays in school is normally distributed with a mean of 5 hours and a standard deviation of 0.5 hours. Every day, Ian stays in school for 5.5 hours. What proportion of students stay fewer than 5.5 hours? 2.For a normally distributed random variable, the standard deviation is 3.7. What is the mean if 10% of the distribution is less than 31? 3.Scores of an achievement test shows that it follows a normal distribution. Its mean is 78 with a standard deviation of 8. Find the interval wherein the middle 80% of the scores lie. 4. Assume that family incomes are normally distributed with mean 30,000php and a standard deviation of 10,000php. If the poverty level is 10,000php, find the percentage of the population that lies in poverty. 5.In 2018, the braking distance of Toyota Camry cars on a wet surface follows a normal distribution. Its mean is 122 feet with a standard deviation of 20 feet. What is the probability that a randomly selected Toyota Camry will have a braking distance of more than 130 feet?
1.Assume that the time a student stays in school is
2.For a normally distributed random variable, the standard deviation is 3.7. What is the mean if 10% of the distribution is less than 31?
3.Scores of an achievement test shows that it follows a normal distribution. Its mean is 78 with a standard deviation of 8. Find the interval wherein the middle 80% of the scores lie.
4. Assume that family incomes are normally distributed with mean 30,000php and a standard deviation of 10,000php. If the poverty level is 10,000php, find the percentage of the population that lies in poverty.
5.In 2018, the braking distance of Toyota Camry cars on a wet surface follows a normal distribution. Its mean is 122 feet with a standard deviation of 20 feet. What is the probability that a randomly selected Toyota Camry will have a braking distance of more than 130 feet?
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