7th Grade Math

(Marvins-Underground-K-12) #1
Lesson 1A Probability 433


  1. FLOWERS Tatiana and her brother are each looking for flowers to give
    their aunt for her birthday. Tatiana likes either red roses or yellow tulips.
    Her brother likes blue irises, yellow daisies, red tulips, or white gardenias.
    Suppose Tatiana and her brother each choose one of their favorite flowers
    at random.
    a. What is the probability that Tatiana will choose a yellow flower? a red
    flower? Then describe the likelihood of each event.


b. What is the probability that her brother will choose a yellow flower? a
red flower? Describe the likelihood of each choice.

3131 GRAPHIC NOVEL Refer to the graphic novel frame below. If Jamar and
Theresa decide to create a music mix for a school dance and include an
equal number of each genre, what would be the probability that any
given song would be from the hip-hop genre?

Refer to the
start of the
chapter.

C 32. REASONING A leap year has 366 days and occurs in non-century years
that are divisible by 4. The extra day is added as February 29th.
Determine whether each probability is 0 or 1. Explain your reasoning.
a. P(there will be 29 days in February in 2032)
b. P(there will be 29 days in February in 2058)


  1. CHALLENGE A bag contains 6 red marbles, 4 blue marbles, and 8 green
    marbles. How many marbles of each color should be added so that the
    total number of marbles is 27, but the probability of randomly selecting
    one marble of each color remains unchanged? Explain your reasoning.

  2. E WRITE MATH Marissa has 5 black T-shirts, 2 purple T-shirts, and
    1 orange T-shirt. Without calculating, determine whether each of the
    following probabilities is reasonable if she randomly selects one T-shirt.
    Explain your reasoning.
    a. P(black T-shirt) = ^1
    3
    b. P(orange T-shirt) =
    ^4
    5
    c. P(purple T-shirt) = _^1
    4


429_439_C08_L1_895130.indd 433 12/29/09 1:19 PM

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