-np - 80 < 60....add 80 to both sides
-np < 80 + 60
-np < 140...divide both sides by p
-n < 140/p ...now multiply by -1 to make n positive, and change inequality sign
n > -140/p
Answer:
a) Simple random sample
b) Random sample
c) None of them.
Step-by-step explanation:
a) This would be a simple random sample given that the dice roll is a random method to select the students and the probability of each outcome of the dice is 1/6.
b) This would be a random sample, given that the cards are shuffled, this is a random event. However, there's a condition on how to select the cards (The top ones are chosen) and therefore this can not be a simple random sample since not all cards have the same probability of being selected.
c) This is not a random sample since there is an specific condition on how to choose the students (by their age)
Begin with the addition: 1/2+1/4 = 2/4+1/4 = 3/4
Therefore, 3.50 is 3/4th of your money
You can solve for x (your money) using a simple cross equation
3/4 = 3.5/x
x=(3.5*4)/3
x=4.67
Answer:
7/8 and 14/16
Step-by-step explanation: for the first one just divide by 8 for the second one divide by 4