Expected number of spots showing
Suppose that the number of dice thrown is a binomial random variable with n = 10 and p = 0.98. What is the expected number of spots showing on the thrown dice? Expected number of spots =
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The Business School Club contains 25 members. Members must be either a Finance Major, or an Accounting Major. There are 16 Accounting Majors, and 14 Finance Majors. How many members are dual majors?
There are 1000 students in the senior class at a certain high school. The high school offers two Advanced Placement math / stat classes to seniors only: AP Calculus and AP Statistics. The roster of the Calculus class shows 100 people; the roster o
Lester Hollar is vice president for human resources for a large manufacturing company. In recent years he has noticed an increase in absenteeism that he thinks is related to the general health of the employees.
Does this provide compelling evidence for concluding that more than 10% of all plates blister under such circumstances? State and test the appropriate hypotheses using a significance level of 0.05.
A sample of 20 glass bottles of a particular type was selected, and the internal pressure strength of each bottle was determined. Consider the following partial sample information:
Determine the area under the standard normal curve that lies to the left of (a) Z=-1.03, (b) Z=-1.42, (c) Z=-0.77, and (d) Z=0.66
The mean annual salary for chauffeurs is $21,000. A random sample of size 45 is drawn from this population. Assume that the population standard deviation is $2,000. What is the probability that the mean annual salary is less than $20,000 More than
Two people are going from Seattle to Portland. Alice has 50% chance of arriving at 5:00 and a 50% chance of arriving at 6:00. Bob's arrival time is independent of Alice's. The number of minutes after 4:30 that he arrives is an exponential random
The IRS was interested in the number of individual tax forms prepared by small accounting firms. The IRS randomly sampled 52 public accounting firms with 10 or fewer employees in the Dallas-Fort Worth area. The following frequency table reports th
A student believes that no more than 25% (i.e., 25%) of the students who finish a statistics course get an A. A random sample of 100 students was taken. Twenty-six percent of the students in the sample received A's. Test the hypotheses at the 5% l
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