Mrs. Johnson buys 2 chickens. The average weight of the 2 chickens is 4 pounds. One of the chickens is 2 pounds heavier. What is
2 answers:
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Answer: b. 0.8413
Step-by-step explanation:
Given : The average time taken to complete an exam, X, follows a normal probability distribution with and
.
Then, the probability that a randomly chosen student will take more than 30 minutes to complete the exam will be :-
[using z-value table]
Hence, the probability that a randomly chosen student will take more than 30 minutes to complete the exam = 0.8413
Option B
Probability of drawing yellow marble followed by a red marble is
<em><u>Solution:</u></em>
Given that a bag containing 12 yellow marbles, 16 red marbles, and 15 green marbles
So total number of marbles = 12 + 16 + 15 = 43
To find: probability of drawing yellow marble followed by a red marble if the first marble is not replaced
<em><u>The probability of an event is given as:</u></em>
<em><u>probability of drawing yellow marble followed by a red marble if the first marble is not replaced:</u></em>
First we pick up yellow marble.
Number of favorable outcomes = 12 yellow marbles
Total number of possible outcomes = 43 marbles
Now we have to pick red marble
But first marble is not replaced
So we have 43 - 1 = 42 number of possible outcomes
Favorable outcomes = 16 red marbles
So probability of drawing yellow marble followed by a red marble is:
Thus probability of drawing yellow marble followed by a red marble is