In a certain barangay, the monthly food expenditures of families average P4,500 with a standard deviation of P750. What is the area of these expenditures that are between P3,900 and P5,850? z1 = P (Z < - z1) = P (Z < - z2) = Total area = .00 .01 .02 .03 .04 .05 .0003 -3.4 -3.3 .0003 .0005 .0003 .0005 .0003 .0003 .0003 .0005 .0004 .0004 .0004

In a distribution of the test grades with the mean of 25 and the standard deviation of 4, what would be the z-score of grade 32? Round to 2 decimals.

I don’t know how to calculate ‘d.’ into my TI-84 Plus calculator. Please show me step by step.

Suppose that time required to compete a 1040R tax form is normally distributed with a mean of 110 minutes and a standard deviation of 15 minutes. What proportion of the 1040R tax form will be completed in less than 121 minutes. Round your answer to at least 4 decimal places.

Suppose that pulse rates among healthy adults are normally distributed with a mean of 79 beats/minute and a standard deviation of 8 beats/minute. What proportion of healthy adults have pulse rates that are at most 92 beats/minute? Round your answer to at least four decimal places.

If a set of observations is normally distributed, what percent of these differ from the mean by (a) more than 2.50? (b) less than 0.640?

In Professor Krugman’s economics course, the correlation between the students’ total scores prior to the final examination and their final‑examination scores is ?=0.5.r=0.5. The pre‑exam totals for all students in the course have mean 280280 and standard deviation 40.40. The final‑exam scores have mean 7575 and standard deviation 8.8. Professor Krugman has lost Julie’s final exam but knows that her total before the exam was 300.300. He decides to predict her final‑exam score from her pre‑exam total. (a) Which of the choices is the least‑squares regression line of final‑exam scores on pre‑exam total scores in this course?

Suppose that you are designing an instrument panel for a large industrial machine. The machine requires the person using it to reach 2 feet from a particular position. The reach from this position for adult women is known to have a mean of 2.7 feet with a standard deviation of 0.5. The reach for adult men is known to have a mean of 3.1 feet with a standard deviation of 0.7. Both women's and men's reach from this position is normally distributed. If this design is implemented, (a) what percentage of women will not be able to work on this instrument panel? (b) What percentage of men will not be able to work on this instrument panel? (c) Explain your answers to a person who has never had a course in statistics. Click here to view page 1 of the table. Click here to view page 2 of the table. Click here to view page 3 of the table. Click here to view page 4 of the table.

Suppose that pulse rates among healthy adults are normally distributed with a mean of  79   beatsminute  and a standard deviation of  8   beatsminute . What proportion of healthy adults have pulse rates that are less than  90   beatsminute ? Round your answer to at least four decimal places.