Answer:
11 years old
Step-by-step explanation:
Maggie's age is x
Maggie's brother = 4x - 7
The sum is 48
x + 4x - 7 = 48
5x - 7 = 48
5x = 55
x = 11
Answer:
a: 11.12%
b: about 2.5%
c: about 2.5%
Step-by-step explanation:
For this situation:
n = 1500
p = 0.35
q = 1 - p = 0.65
a: Find: P(p < 0.335)
See attached photo 1 for the solution
b. Find P(p > 0.37)
Since it says that σ = 0.01, and it's asking for the percent of the proportion larger than 0.37, they are asking for the percent of the proportion that is 2 standard deviations higher than the mean. Using the 68-95-99.7 rule, we have a total of 5% of data that is more than 2 standard deviations away, but that is on both sides of the mean. Divide that in half to get the total above 0.37. So there should be about 5%/2 = 2.5% of the proportions.
c: Find P(p < 0.33)
0.33 is 2 standard deviations below the mean, so the percentage is 2.5% for similar reasons for part b
Answer:
z-y/x
Step-by-step explanation:
then z
then z-y
z-y/x
Answer:
a+b
Step-by-step explanation:
=1a+1b
=1(a+b)
=a+b