A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last between 1000 and 1250 hours?
A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last more than 1250 hours?
A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last less than 1250 hours?
A college gives an entrance exam which results in a mean score of 247 with a standard deviation of 28. If only the upper 25 percent of the applicants are to be admitted, what should the cutoff score be?
Mr. Fedor is looking to buy a new house this year. The mean price for homes is $275,000 with a standard deviation of $18,000. If Mr. Fedor is going to look at homes in the middle 80% of this distribution, then what is the minimum price house he would buy and what is the maximum price house he could buy.
Mensa is an organization that accepts members who score in the top 2% of the population of standard intelligence tests. If the mean IQ is 100 with a standard deviation of 15, then what should the minimum IQ score be accepted by Mensa?
The average age of a NBHS senior is 19.4 years. If the distribution of ages is normal and 10% of the seniors are older than 20.6 years, then find the standard deviation. Round your answer to a whole number.
The average height of senior girls at NBHS is 63 inches. The standard deviaiton is 4 inches. If the variable is normally distributed, find the probability that the height of 36 girls would be greater than 64 inches. Use the central limit theorem to solve.