The life expectancy of batteries has a normal distribution with a mean of 350 minutes and a standard deviation of 10 minutes. a) What is the probability that a randomly selected light bulb will have a lifespan of more than 320 hours? b) To what value of L hours can the la The lifetime of a light bulb is a random variable with a normal distribution of x = 300 hours, σ = 35 hours. 3 The most passive method of data collection is observation. The most frequent observation in a data set is known as the mode. Write TRUE OR FALSE for each question: 1 Standard deviation measures central location. Assuming a normal distribution, how many women ran more quickly than Joan? Joan's finishing time for the bolder boulder 10 km race was 1.77 standard deviations faster than the women in her age group. How many tubes do have a length: a) between 16.5 cm and 18.1 cm b) greater than 17 cm The arithmetic mean is 17.27 cm, and the standard deviation is 1.2 cm. The participants receiving the top 5% of the s Consider that the scores in the exam are normally distributed with a mean of 78 and a standard deviation of 7.5. In a college entrance exam, the participants are rated as excellent, very good, good, and fair. What is the value of x if it is z = +1.50?
Suppose a distribution has a mean µ = 8 and standard deviation σ = 4. three claims in a given week, more than four claims in a given Assuming that a Poisson distribution can model the number of claims, find the probability it receives. An insurance company receives, on average, two claims per week from a particular factory.
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