Statistics and Probability Answers

given a population of 2000 normally distributed stores with mean equal to 74, and a standard deviation of 6. How many scores are between 84 and 74

Random samples of size 4 are drawn with replacement from a finite population 3,6,9. Find the variance of the sample and the standard deviation of the sample

A box contains 20 balls that are exactly alike except that 10 are red, 6 are blue, and 4 are black. (a) If a single ball is drawn from a box, what is the probability tat it is red? (b) If a single ball is drawn from the box, what is the probability that it is blue or black? (c) If instead two balls are drawn from the box at the same time, what would be the probability that both are black?

Colored Wheel

A survey on 200 Senior High School learners on how much time they read per

week has a confidence interval of (13.5, 17.9) in hours at 95% confidence level.

What is the margin of error? _________________________

What is the average time they read per week? __________________

Compute the length of the confidence interval for estimating the population

mean using a sample size of 300 and with a standard deviation 84. Use a 92%

confidence level.

Write the probability distribution of a random variable R representing numbers of red ball when 3 balls are drawn in succession without replacement from a jar containing 4 red and blue balls

Suppose the mean number of days to germination of a variety of seeds is 34, with a standard deviation of 4.3 days. What is the probability that the mean germination time of a sample of 250 seeds will be within 0.5 days of the population mean?

46 % of the 100 students in Emmie Xi Hem International School students said that they had been late in their first period classes. What is the lower bound of the 99% confidence interval for the proportion of students in the said school who had been late in their first period classes.

Note: Write your answers in decimal form and round it to 4 decimal places.

42 % of the 100 students in Emmie Xi Hem International School students said that they had been late in their first period classes. What is the upper bound of the 99% confidence interval for the proportion of students in the said school who had been late in their first period classes.

Note: Write your answers in decimal form and round it to 4 decimal places.

An electronic company in Laguna manufactures resistors that have a mean resistance of 120 ohms and a standard deviation of 13 ohms. Find the probability that a random sample of 40 resistors will have an average resistance greater than 114 ohms.