It is biased because they surveyed people who were at a park, therefore they enjoy parks and would want more in the area
Answer:
Step-by-step explanation:
The range of the function is :
all real numbers less than or equal to - 1
Answer:
65.4% to 74.6%
Step-by-step explanation:
68% is approximately plus minus 1 standard deviations.
sigma=sqrt(n*p*(1-p))=sqrt(100*.7*.3)=4.58
so we're looking at 70+4.6 and 70-4.6.
Answer:
99.73% of bags contain between 62 and 86 chips .
Step-by-step explanation:
We are given that the number of chips in a bag is normally distributed with a mean of 74 and a standard deviation of 4.
Let X = percent of bags containing chips
So, X ~ N()
The standard normal z score distribution is given by;
Z = ~ N(0,1)
So, percent of bags contain between 62 and 86 chips is given by;
P(62 < X < 86) = P(X < 86) - P(X <= 62)
P(X < 86) = P( < ) = P(Z < 3) = 0.99865 {using z table}
P(X <= 62) = P( <= ) = P(Z <= -3) = 1 - P(Z < 3)= 1 - 0.99865 = 0.00135
So, P(62 < X < 86) = 0.99865 - 0.00135 = 0.9973 or 99.73%
Therefore, 99.73% of bags contain between 62 and 86 chips .
I'm not sure but maybe the answer is :
68 / 74 = 0.919