Stats Help for College-level Students

Discrete data & Continuous data

What are discrete and continuous data

Measure of Central Tendency: The Mode

Definition of the mode & examples

Measure of Central Tendency: The Median

Definition of the median & examples

Calculating mean

The 30 members of an orchestra were asked how many instruments each could play. The results are set out in the frequency distribution. Calculate the mean number of instruments played: Number of instruments, x 1 2 3 4 5 Frequency, f 11 10 5 3 1

Mean

Find the mean of the set of numbers 63,65,67,68,69,70,71,72,74,75

Poisson approximation to binomial distribution

A factory packs bolts in boxes of 500. The probability that a bolt is defective is 0.002. Find the probability that a box contains 2 defective bolts.

Poisson Approximation to binomial distribution

Find the probability that at least two double 6's are obtained when two dice are thrown 90 times.

Poisson approximation to binomial distribution

In a large town, one person in 80, on the average, has blood of type X. a)If 200 blood donors are taken at random, find an approximation to the probability that they include at least five persons having blood of type X. b)How many donors must be taken at random in order that the probability of including at least one donor ...continues

Binomial distribution

A hockey team consists of 11 players. It may be assumed that, on every occasion, the probability of any one of the regular members of the team being unavailable for selection is 0.15, independently of all other members. Calculate, giving three significant figures in your answers, the probability that, on a particular occasion, ...continues

Normal approximation to binomial distribution

The probability that a patient recovers from a rare blood disease is 0.6. If 100 people are known to have contracted this disease, what is the probability that less than 50 people recovers from this rare blood disease?