Danny A

I'm given this problem:

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"Power companies trim trees growing near their lines to avoid power failures due to falling limbs in storms. Applying a chemical to slow the growth of the trees is cheaper than trimming, but the chemical kills some of the trees. Suppose that one such chemical would kill 20% of the sycamore trees. The power company tests this chemical on 250 sycamores. Consider these as an SRS from the population of all sycamore trees.

(a) What are the mean and standard deviation of the number of trees in the sample that are killed?

(b) What is the probability that at least 60 trees (24% of the sample) are killed?"

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I found the mean (20% of 250 = 50), but I have no clue on how to find the sample standard deviation here..

Can someone help me out with how to get it in this case? No other information was given. No data set, no population standard deviation. Everything in that problem is everything I have to use.

I have some friends that I met from Mario Kart 7 and I don't know how I can add them to my 3DS Friends List.

Kingdom Hearts or Final Fantasy???

(Include favorite character from the game/series. Which part is your favorite also?)

2 years ago, me and this girl I met didn't get along because of someone told my secret about her to everyone i know and then she found out and got digusted of me (it wasnt horny). i keep trying to apologize to her saying it was only an accident and i was trying to prevent it, but she was still mad at me. What can i do? I have seen her pass by me a few times for 2 years, but doesn't say anything, and we used to walk home together, but we live close to each other. Can any of you help me with this?

im not mean to anyone

i want to see how ur skills are. no cheating and u can have as many as 10 for jokes and riddles each

1. What lies on the ground and weighs nothing?

2. What can you see in the water that never gets wet?

3. What can you feel but never see?

I feel it's discrimnating and knowing Barack Obama just signed the bill and there was a wild chimpanzee, it's just not right.

*Be Specific

Fast-Food Restaurant- Mickey D's (McDonald's) or Wendy's

Pasta - Lasangna or Fetticuine Alfredo

Phone - iPhone or Voyager

Better Gender - Male or Female

Charlie's Angels - 2000's or 1970's

Gum - Orbit or Trident

Board Game - Checkers or Chess

TV - Cable or Satellite

Hardware Store - Lowe's or Home Depot

Website - Yahoo! or YouTube

Answer Honestly plz.

Can someone give me steps to the mission mysterious tremors in club penguin?

How do you get big bait for the mission Secret Of The Fur in Club Penguin?

In the HQ mission, Secret Of The Fur, how do you get the jet pack fuel? I really need the answers.

Which is best?

Kelly Clarkson

Ruben Studdard

Fantasia Barrino

Carrie Underwood

Taylor Hicks

Jordin Sparks

David Cook

Game Website - Pogo or Candystand

Soda - Pepsi or Coke

Sloppy Joe - Homemade or Manwich

Car - Mustang or Lamborghini

Club Website - Club Penguin or MySpace

Food - Salad or Pizza

Game - Kingdom Hearts or God Of War

Which one is the best cheetah girl?

Raven

Keily

Sabrina

Adrienne

Mouse - Kensington or Logitech

Fruit - Banana or Apple

Liquid - Soda or Seltzer

Game Series - God Of War or Kingdom Hearts

Emotion - Happy or Excited

TV - Cable or Satellite

Tissues - Puffs or Kleenex?

Laptop - Toshiba or HP?

Mouse - Kensington or Yahoo?

Fruit - Chiquita or Homemade?