Please help me in some 7th grade questions? 10 points!?

xxrawrxx

2012-10-09 09:31:43 UTC

1. Sara selects two cards at random from a standard deck of 52 cards. Which of the following could be used to calculate the probability that she will select two even numbered cards if she does not replace the first card before selecting the second? Note: For this problem, face cards and aces are not numbered cards.
a) 16/52 times 16/51
b) 16/52 times 15/51
c) 16/52 times 15/52
d) 16/52 times 16/52

2. Luke has a spinner divided into 5 equal segments, each with a different color. In 40 spins, he spun yellow 4 times. How does this compare to the expected result?
a) The experiment resulted in 4 more yellows than expected.
b) The experiment resulted in 8 more yellows than expected.
c) The experiment resulted in 4 fewer yellows than expected.
d) The experiment resulted in 8 fewer yellows than expected

3. Stefan flips a coin two times. Which of the following shows the number of possible outcomes?
a) 2
b) 4
c) 6
d) 8

4. Henry grabs one shoe at a time at random without replacement from a box of 14 shoes in his closet. The box contains 6 brown shoes, 4 black shoes, and 4 sneakers. What is the probability that the first two shoes he chooses will be black? Round to the nearest percent if necessary
a) 7%
b) 8%
c) 16%
d) 18%

5. Which type of probability tool would be an appropriate choice for a simulation that models 7 equally likely outcomes?
a) Standard die
b) spinner
c) coin
d) standard deck of cards

6. Which describes independent events?
a) Selecting two tickets by choosing a raffle ticket at random from a jar and disposing of the first ticket before selecting the second ticket.

b) Selecting a blue and green balloon by choosing one string at a time at random from a clown's hand, handing the first choice to your brother.

c) Rolling two ones in a row using a standard die.

d) Getting 5 multiple choice questions correct if you select at random from each of the possible answers, never repeating an answer choice.

7. Lyle has a bowl of fruit on his dining room table. It contains 2 oranges, 6 apples, and 2 peaches. Suppose he selects a piece of fruit at random from the bowl. What is the probability that he selects either an apple or a peach?
a) 20%
b) 40%
c) 60%
d) 80%

8. Which of the following is not a true general statement?
a) Volunteer sampling is a reliable sampling method.
b) Stratified sampling results in sampling populations proportionate to each subcategory populations.
c) A representative sample is large and shares the same characteristics as the general population.
d) A sample is a group of units selected from the larger population.

9. Which set of data shows 40% as the experimental probability of a particular traffic light being green on your way to school in the morning?
a) 10 of 25 selections at random from a card deck being a black card, with black representing a green light
b) 2 tails in 20 coin flips, with tails representing a green light
c) 2 odd-numbers in 8 rolls of a standard die, with odd numbers representing a green light
d) spinning 20 vowels out of 40 spins of a spinner with 6 equally divided sections labeled with 3 vowels and 3 consonants

10. A local radio station is researching radio listening habits. The station manager surveys listeners who call in to request songs. Which of the following represents an experimental unit?
a) all of the listeners surveyed
b) all of the listeners
c) listeners in the 18-24 age range
d) one listener

THANK YOU SO MUCH! 10 POINTS Im horrible in math -.-