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Proportion Sample Size
This calculator determines a sample size to select to meet certain criteria related to a confidence percentage, reliability percentage, and a p value proportion. Simply enter your values not using percentage signs. This works whether p^ is known or not known.

Social Security and Covered Compensation
Calculates an estimated monthly Social Security Benefit based on a smooth estimate of pay over your work history.
Also calculates a covered compensation amount based on a year of birth

Work
Solves for any of the 3 variables, Work (W), Force (F) and Distance (d) in the work formula

Work Word Problems
Given Person or Object A doing a job in (r) units of time and Person or Object B doing a job in (s) units of time, this calculates how long it would take if they combined to do the job.

the square root of twice a number is 4 less than the number
Ruth prepares 7 kilograms of dough every hour she works at the bakery. How much dough did Ruth prepa
There are 32 female performers in a dance recital. The ratio of men to women is 3:8. How many men ar
Selling a Business and Reinvesting Proceeds
A dad gave his 3 sons each the same amount of money in an envelope. He took \$20 from one son for get
The cost of renting a rototiller is \$19.50 for the first hour and \$7.95 for each additional hour. Ho
12.66 g of calcium are heated in air,17.73 g of calcium oxide is formed.The percent oxygen in the co
the sum of n and twice n is 12
two mechanics worked on a car. the first mechanic worked for 10 hours, and the second mechanic worke
Dan makes 11 an hour working at the local grocery store. Over the past year he has saved 137.50 towa
2 consecutive even integers that equal 118
You have a total of 42 math and science problems for homework. You have 10 more math problems than s
Sally can paint a room in 7 hours while it takes Steve 6 hours to paint the same room. How long woul
You collect a total of 75 in donations from three people. The three donations are in the ratio 4:4:7
A house valued at 70,000 in 1989 increased in value to 125,000 in 2000. Find a function which gives
Melanie started working in her garden at 8:25 a.m. She took a break at 11:10 a.m. How many minutes d
Will earned 9.50 an hour. He worked 40 hours one week, how much will he make?
The ratio of men to women working for a company is 4 to 7. If there are 319 employees total, how man
In 2000 a company increased its workforce by 50%. In 2001 it decreased its workforce by 50%. How doe
An experienced accountant can balance the books twice as fast as a new accountant. Working together
An employee earns \$7.00 an hour for the first 35 hours worked in a week and \$10.50 for any hours ove
writing and solving equations
writing and solving equations
A bag contains 3 red marbles and 4 blue marbles. a marble is taken at random and replaced. another m
A random sample of n = 10 flash light batteries with a mean operating life X=5 hr. And a sample stan
A random sample of STAT200 weekly study times in hours is as follows: 2 15 15 18 30 Find the sam
Mimi just started her tennis class three weeks ago. On average, she is able to return 20% of her opp
Assume that you make random guesses for 5 true-or-false questions
Let P(n) and S(n) denote the product and the sum, respectively, of the digits of the integer n. For
I HAVE \$11.60, all dimes and quarters, in my pocket. I have 32 more dimes than quarters. how many di
Two mechanics worked on a car. the first mechanic worked for 5 hours snd the second mechanic worked
At the end of the day, a bakery had 1/2 of a pie left over. The 4 employees each took home the same
Blanca works as a salesperson and earns a base salary of \$72 per week plus a commission of 12% of al
Jim works for his dad and earns \$400 every week plus \$22 for every chair (c) he sells. Write an equa
Mimis math class starts at 9:00 A.M. and lasts for 1 hour and 55 minutes. After math class, Mimi has
Round 12.4263 to the nearest cent
Yael worked out at a gym for 2 hours. Her workout consisted of stretching for 21 minutes,jogging for
The Lakers recently scored 81 points. Their points came from 2 and 3 point baskets. If they made 39
Here is Practical Explanation about Next Life, Purpose of Human Life, philosophical/religious facts,
Here is Practical Explanation about Next Life, Purpose of Human Life, philosophical/religious facts,
Penelope and Owen work at a furniture store. Penelope is paid \$215 per week plus 3.5% of her total s
Finance
Is it correct to word "10% * 50 + 50" as "10% upper 50"?
The ratio of men to women working for a company is 3 to 4. If there are 81 men working for the compa
Diana earns \$8.50 working as a lifeguard. Write an equation to find Dianas money earned m for any nu
A coat is on sale for 35% off. The regular price of the coat is p. Write and simplify and expression
A plumber charges \$50 to visit a house plus \$40 for every hour of work.
porportion problems
Frank is a plumber who charges a \$35 service charge and \$15 per hour for his plumbing services. Find
Problems Involving Rational Expressions
Problems Involving Rational Expressions
Adam, Bethany, and Carla own a painting company. To paint a particular home, Adam estimates it woul