Answer:
Step-by-step explanation:
The lengths of human pregnancies are normally distributed with a mean of 268 day and a standard deviation of 15 days
From the information given,
mean, u =268
standard deviation, s = 15
x is number of days
For normal distribution,
z = (x-u)/s
Probability of x greater than or equal to 300 will be 1 - probability of x lesser than 300
z = (300-268)/15 =32/15 = 2.13
Looking at the normal distribution table, the value is 0.98341
Probability of x greater than or equal to 300 will be 1 -0.98341
= 0.01659
I’m not sure, maybe try going on quizzes
Answer: y = 31
Step-by-step explanation:
The equation of a line is y = mx+b
Plugging in the values, we get
y = 4*8 + (-1)
y = 32-1
y = 31
First of all, this is not an observational study, but an experiment, since we have two groups and one of the two groups is manipulated or treated. In an observational study the subjects are only observed.
Second, the students did not choose their groups - so we can't choose the last answer.
Therefore the correct answer is:
This is an experiment because a treatment was applied to a group.
Eighty-three point four hundred and ninety-seven thousandths. Hope this helps!