Statistics questionnnn?

spongebob 018 image

Spongebob

There is a multiple choice exam. Only one of five possibilities is correct for each question. There are 60 questions, and you need 19 correct to pass. What is the probability that you pass?

I know the answer is 0.0179, but how do you do it? What function to use? I don't want to use binomial and write out 19 terms...

Answer
Spongebob Squarepants -

Agree, you don't want to add up 19 through 60 terms! So, your text should have explained the Normal Approximation to the Binomial with Continuity Adjustment:

mean = np = 60(1/5) = 12
std. dev. = sqrt[np(1-p)] = 3.098

Now, the continuity adjustment is done because the Normal is "continuous" and Binomial is "discrete". So, instead of using P(X > or equal to 19) we will be using P(X > 18.5) ; look in your text for more detail.

Next, just use the Normal by converting the data to z-values

P(X > or equal to 18.5) = P[z > (18.5 - 12) / 3.098] = P(z > 2.098) = 0.018

Note: Using my TI, the actual Binomial is 0.022. Pretty close! Our approximation would have been even closer if p was closer to 1/2 rather than 1/5.

Hope that helps

Best Nintendo Ds games?

Q. Im getting an R4 card soon :D and i wanted to know what ye think are the best games ever made so I can download them nd try them out :) lists of the names of games would be nice :) thank you in advance ;)

Answer
would you like these ones? see the lists as follows:

001 Elite Forces Unit 77 (EU)
002 Tetris DS
003 Super Mario 64 DS
004 Yoshi Touch & Go
005 Harvest Moon: Frantic Farming (US)
006 Windy x Windam
007 Spider-Man 2
008 Scooby-Doo! Who's Watching Who
009 Scooby-Doo!: Unmasked
010 Pokemon Dash
011 SpongeBob SquarePants & Friends: Battle for Volcano Island
012 SpongeBob SquarePants and Friends Unite!
013 Strawberry Shortcake: Strawberryland Games
014 Strawberry Shortcake: The Four Seasons Cake
015 River City Soccer Hooligans (US)
016 Rooms: The Main Building (US)
017 Ant Nation (EU)
018 Yamaha Supercross
019 101 Dino Pets
020 IL-2 Sturmovik: Birds of Prey (EU)
021 Garfield Gets Real (E)
022 Mysterious Dungeon: Shiren the Wanderer
023 Zoo Tycoon 2 DS
024 MX VS ATV Untamed
025 Ferrari Challenge
026 Incredibles, The: Rise of the Underminer
027 M&M's Adventure (US)
028 TINCan! Escape (EU)
029 Dodge Racing Charger vs. Challenger (US)
030 Deca Sports DS (US)

Powered by Yahoo! Answers