Proportion of washers
In a sample of 112 washers, 8 are "our of spec". Estimate the proportion of washers that are being prodiced tat are out of spec.
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A mammologist gathered 90 female kangaroo rats and 27 of them were pregnant. Employ the normal distribution to find a 95% confidence interval for the pregnancy rate in female kangaroo rats. Show work
You're flipping a fair coin. Initially you just flip it. After that, if it was heads previous round you turn it over to tails (so it guarantees a tails in the current round), and if it was tails you flip it again in the current round. Determine th
A biologist weighs 7 lab mice. The following results were obtained: 31.2, 28.3, 32.8, 29.1, 24.0, 38.2, 33.4 g. Find a 99% confidence interval for the mean weight. Show work
Assume the length of time students take in writing a standard entrance examination is normally distributed with mean 60 minutes, std. deviation 8 minutes
Throughout an 80 hour period, there are 7 unplanned work stoppages on production line. Determine the rate per hour at which stoppages occur.
Discuss the difference between mutually exclusive and independent events.
The tool shop has 8 power screw drivers and two have a short. A foreman takes 4 of screw drivers to his crew. That is the probability that fewer than two have a short?
A group of n people of different heights are randomly ordered. Given that the very shortest person is first and the very tallest person is last, what is the probability the intermediate one are ordered by increasing height?
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