How do you do the bottom portion of this? It’s my younger sister’s homework . I’m a sophomore and have no idea how to do it!
1 answer:
Hello!
Looking at how you set up the proportion, it is correct.
Although, the multiplication is incorrect.
You are supposed to multiply 68 by 25 which comes out to 1700. Then, you should divide it by 100 to get x = 17.
(divide both sides by 100)
Therefore, you should expect Sparky to catch it 17 times.
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Answer:
P(Y ≥ 15) = 0.763
Step-by-step explanation:
Given that:
Mean =135
standard deviation = 12
sample size n = 50
sample mean = 140
Suppose X is the random variable that follows a normal distribution which represents the weekly supermarket expenses
Then,
The probability that X is greater than 140 is :
P(X>140) = 1 - P(X ≤ 140)
From z tables,
Similarly, let consider Y to be the variable that follows a binomial distribution of the no of household whose expense is greater than $140
Then;
∴
P(Y ≥ 15) = 1- P(Y< 15)
P(Y ≥ 15) = 1 - ( P(Y=0) + P(Y=1) + P(Y=2) + ... + P(Y=14) )
P(Y ≥ 15) = 0.763