Statistics and Probability Answers

What proportion of farmers in the community grow either oranges or lemons

What is the corresponding z – score value when its area in the normal curve is 0.2123? Use the z- table to find the value

What is the area of the region that corresponds to 1.96? *

Renzo tossed a pair of dice five times. What is the probability that he will get at least three "9"

If the probability that it may rain tomorrow is 2/5, what is the probability that it may not rain?

The average number of automobiles per minute stopping for gas at a particular service station along the Coastal Road is 4. What is the probability that in any given minute more than two will stop for gas?

Medical literature tells us that our blood is mainly composed of red and white blood cells corpuscles and a normal human body must average 7250/mm³ of white blood cells counts. If a sample of 15 individuals chosen at random from a certain place has an average of 4850/mm³ with a standard deviation of 2500/mm³ would you say that the people in that place have low white blood cell counts?

a. Formulate the null and alternative hypothesis in sentence and in symbol

b. Determine what test statistic to use

c. Compute the test statistic

d. Final answer

Medical literature tells us that our blood is mainly composed of red and white blood cells corpuscles and a normal human body must average 7250/mm³ of white blood cells counts. If a sample of 15 individuals chosen at a random from a certain place has an average of 4850/mm³ with a standard deviation of 2500/mm³ would you say that the people in that place have low white blood cell counts

In a Science test, the mean score is 42 and the standard deviation is 5. Assuming the scores are normally distributed, what percent of the score is:

14. Between 30 and 48?

If the systolic blood pressure for a certain group of obese people has a mean of 132 and a standard deviation of 8, find the probability that a randomly selected person will have below 148 blood pressure. Assume the variable is normally distributed.