Math Problem Statement

A pet store has 1111 ​puppies, including 44 ​poodles, 44 ​terriers, and 33 retrievers. If Rebecka and​ Aaron, in that​ order, each select one puppy at random with replacement​ (they may both select the same​ one), find the probability that they both select a poodle. Question content area bottom Part 1 The probability is enter your response here. ​(Type an integer or a simplified​ fraction.)

Solution

The problem asks to find the probability that both Rebecka and Aaron select a poodle, with replacement.

Step 1: Probability of selecting a poodle

  • The total number of puppies is 1111.
  • The number of poodles is 44.

So, the probability that one person (Rebecka or Aaron) selects a poodle is:

P(poodle)=441111P(\text{poodle}) = \frac{44}{1111}

Step 2: Probability that both select a poodle

Since the selections are independent (because of replacement), the probability that both Rebecka and Aaron select a poodle is:

P(both poodles)=P(Rebecka selects poodle)×P(Aaron selects poodle)P(\text{both poodles}) = P(\text{Rebecka selects poodle}) \times P(\text{Aaron selects poodle})

P(both poodles)=441111×441111P(\text{both poodles}) = \frac{44}{1111} \times \frac{44}{1111}

P(both poodles)=44×441111×1111P(\text{both poodles}) = \frac{44 \times 44}{1111 \times 1111}

P(both poodles)=19361234321P(\text{both poodles}) = \frac{1936}{1234321}

Thus, the probability that they both select a poodle is:

19361234321\boxed{\frac{1936}{1234321}}

Let me know if you want more details or have any questions!


Here are five related questions for further practice:

  1. What is the probability that both select a terrier?
  2. What is the probability that Rebecka selects a terrier and Aaron selects a poodle?
  3. What is the probability that neither selects a poodle?
  4. If the selection was without replacement, how would the probability change?
  5. What is the probability that Rebecka selects a retriever and Aaron selects any puppy other than a retriever?

Tip: When dealing with "with replacement" problems, each event remains independent, so the total probability is just the product of individual probabilities!

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Math Problem Analysis

Mathematical Concepts

Probability
Independent Events
With Replacement

Formulas

P(both events) = P(event 1) × P(event 2)
P(poodle) = number of poodles / total puppies

Theorems

Multiplication Rule for Independent Events

Suitable Grade Level

Grades 9-12