Statistics and Probability Answers

If two dies are toced together,what is the probability of having equal outcomes

1/6
5/36
1
6

The annual salaries of employees in a large company are approximately normally distributed with a mean of $50000 and a standard deviation of $20000.

a. What percent of people earn less than $40000?
b. What percent of people earn between $45000 and $65000?
c. What percent of people earn more than $70000?

If two dies are toced together what is the probability of having sum of 5 as the outcome.

19
16
1/8
1/10

In how many ways can a committee of 5 people be chosen out of 9 poeple?

254
126
120
131

In a study on survival time for ten patients following a new treatment for AIDS. The time in months were given thus: 24, 12, 8, 20, 3, 18, 24, 25,and 27.Determine the mode for the given data.

17.9
24
18
24

1. The new Twinkle bulb has a standard deviation hours. A random sample of 60 light bulbs is selected from inventory. The sample mean was found to be 500 hours.

Construct 90%, 95% and 99% confidence intervals for the mean life,  of all Twinkle bulbs. Round to the nearest three decimals.

Please help me solve this with steps

True or False. Give reason.

The mean and variance of then Poison distribution are equal.

For the following population of N=6 scores:

11, 0, 2, 9, 9, 5

(a) calculate the range and standard deviation.

(b) add 2 points to each score and compute the range and standard deviation again. Describe how adding a constant to each score influences measures of variability.

In a litter of seven kittens, three are female.
You pick two kittens at random.
a. Create a probability model for the
number of male kittens you get.
b. Find the expected number of males.
c. Find the standard deviation for your
distribution.

A box contains four slips of paper marked 1,
2, 3, and 4. Two slips are selected without
replacement. Make a Probability Distribution
for X, if X = the sum of the two numbers.