Uma missão tripulada ao planeta Marte _e, ainda, um Desafio cientifico e tecnológico, a começar pelas grandes distancias a serem superadas. A distancia da Terra _a Marte,
medida em uma determinada hora e dia do ano, e aproximadamente igual a duzentos e
quatro milhões, novecentos e vinte e seis mil quilômetros. Qual a forma correta de
escrever, em quilômetros, esta distancia no sistema decimal?
A) 200.492.600
B) 204.090.026
C) 204.900.260
D) 204.926.000
E) 240.926.000

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?