When calculating the standard deviation, what must be done in order to obtain an unbiased estimate of the population? add 1 to n subtract 1 from x subtract 1 from n subtract 1 from n?

Janelle has recently been hired for the job of library assistant the following graph shows what percentage of her time will be spent on each of the five tasks each day.

You have a summer job running errands for a local buisness. You earn $5 per day plus $2 for each errand you run. How many errands must you run to earn $17 in one day? Write a verbal model for the problem. (Use only words)

Rusty has 3 cars for every 9 trucks it owns. If the company owns 31 cars, how many trucks do the company own?

Shayla's and Marque's restaurant bill comes to $23.40. They are planning to tip the waiter 15% of their bill. How much money should they leave for a tip?

Jeff is going skiing it cost $65 to rent skis plus $10 an hour to ski he doesn't want to spend more than $120 and you have to pay for a whole hour if you don't see the whole out he wants to know how long can he ski write and solve an inequality to

A class consists of 12 students (six boys and six girls) and one teacher. In how many ways can the students sit in a circle?

This equation shows how a sapling's height depends on its age. h = 3a The variable A represents the age of the sapling in years, and the variable h represents the height of the sapling in inches.

Simplify the expression - 4x2 (3x - 7)

What is x plus 34 times 34 if x equals 3

As the days grow shorter in Argentina (S. America), what happens to the length of the nights in England? a. The nights get shorter. b. The nights get longer. c. The length of the nights remains the same.