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The lifetime of a semiconductor laser has a lognormal distribution, and it is known that the mean and standard deviation of lifetime are 10,000 and 20,000, respectively.
a) Calculate the parameters of the lognormal distribution
b) Determine the probability that a lifetime exceeds 10,000 hours
c) Determine the lifetime that is exceeded by 90% of lasers
The calculated Z test statistic is a positive value that leads to a p-value of .045 for the test. If the significance level (α) is .01, the null hypothesis would be rejected.
The average age in the sample was 22.5 years with a standard deviation of 5 years. Construct a 95% confidence level. What is the probability that the sample mean will be more than $306.60?
Find out the area using Normal distribution. As, if Z is a standard normal variable find out the probability that Z lies.
A catering service offers 9 appetizers, 8main courses, and 12desserts. A banquet chairperson is to select 8 appetizers, 3main courses, and 4 desserts for a banquet. In how many ways can this be done?.
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and = 0.01. What are the critical values?
More than 13 successes in 19 trials with a 40 percent chance of success. (Round the answer to 4 decimal places.) Fewer than 7 successes in 15 trials with a 40 percent chance of success. (Round the answer to 4 decimal places.)
A linear regression between Y and X produced the following equation for the least squares line:
the dividend yield on shareholders funds of australias top 120 companies for the week ended friday 10 july 2009 is
Table shows the smoking habits of group college students. If student is selected at random, determine the probability of getting someone who is man or a woman.
Seven students have applied for merit scholarships. This year 3 merit scholarships were awarded. If a random sample of 3 aplications (from the population of 7) is selected,
Assume it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately normal with mean $25 and standard deviation $8.
Smaller clearance (i.e., x1 - x2) than 0.09 should be 0.006, what distance between the nominal dimensions of the two parts (i.e., u1 and u2) should be specified by the designer?
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