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rewona [7]
3 years ago
8

PLZ HELP ME I NEED THIS ASAP

Mathematics
1 answer:
Andru [333]3 years ago
3 0

Mean = 110

Sample size = 45

Standard deviation = 6

Z score for 90% is 1.645 ( from Z-table).

Lower Limit = Mean - Z(SD/√Sample size))

Lower limit = 110 - 1.645(6/√45)

Lower limit = 108.5

Upper Limit = Mean + Z(SD/√Sample size))

Lower limit = 110 +1.645(6/√45)

Lower limit = 111.5

The interval is (108.5, 111.5)

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Please explain this problem to me. 
alexdok [17]
2. First do 4x9.75 which equals 39. Since 6 people need regular shoes do 6x3.95 which equals 23.70. Then do the membership shoes which is 4x2.95 which equals 11.80. add all the answers you've gotten together. 39+23.70+11.80= which equals 74.50

3. Find the total cost of the 2 member lanes. 7.50x2= which equals 15. Then subtract. 23.85-15= which equals 8.83. Then devide 8.85 by 2.95 to find out the number of shoes which is 3. He rented three pairs of shoes.

4. Divide 20 by 1.25. Natalie can buy 16 medium sodas
6 0
3 years ago
Solve for n : 21k 3n + 9p >3p+12
pickupchik [31]

Answer:

n>\frac{-6p+12}{63k}

Step-by-step explanation:

21k3n>3p-9p+12

21k3n>-6p+12

3n>\frac{-6p+12}{21k}

n>\frac{-6p+12}{63k}

Are you sure you typed the question correctly? like is there supposed to be something between the 21k and the 3n?

7 0
4 years ago
Is (-1, -1) a solution of y = 3x + 2?
77julia77 [94]

For this, to figure that out plug in (-1, -1) into the x and y coordinates and solve:

-1=3(-1)+2\\ -1=-3+2\\ -1=-1

Since -1 = -1 is a true statement, (-1,-1) is a solution to this equation.

6 0
3 years ago
Which of the following descridbes the translation of the graph of y=x^2 to obtain the graph of y=-x^2-3
kogti [31]

Answer:

the graph translated down 3 or y-3

Step-by-step explanation:

(-3) is the y-intercept

6 0
3 years ago
Which values are solutions to the inequality below?<br> Check all that apply
Masja [62]

Answer: b, c, e

Step-by-step explanation:

7 0
3 years ago
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