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Anettt [7]
3 years ago
11

22 random samples were selected from a population that has a normal distribution the sample has a mean of 99 and a standard devi

ation of 5 construct a 95% confidence interval for the population standard deviation .
Mathematics
2 answers:
strojnjashka [21]3 years ago
6 0

Answer:

4, 7

Step-by-step explanation:

gradpoint

olga2289 [7]3 years ago
3 0

Answer:

(96.91, 101.09)

Step-by-step explanation:

To calculate the interval, you require the Z value at 95% confidence interval. The Z value is 1.96. The formula to calculate the confidence interval:

X-Zs/\sqrt{x} \\X+Zs/\sqrt{x}

Where X is the mean and s is the standard deviation and x the sample size:

99-1.96\cdot{5}/\sqrt{22} \\99+1.96\cdot{5}/\sqrt{22}

The interval is (96.91, 101.09)

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200 children attended the school play. Of the total attendance, 40% were boys. How many
vesna_86 [32]

Answer:

120

Step-by-step explanation:Do you hundred times 40% equals 80. 200-80 = 120 which is the number of girls that attended.

5 0
3 years ago
Diane sold t-shirts at a festival and made a profit of $84 . She made $6 for each t-shirt she sold. Her total expenses were $30.
sweet-ann [11.9K]

Answer:

9 t-shirts

Step-by-step explanation:

Well if she made a profit of $30 that would mean that you would subtract $84-$30 which would give you $54. Than you would divide 54/6 to find how much t-shirts she sold.

-Hope this helped (this is one of the first questions ive answered )

7 0
3 years ago
X^2-12x+12=0 completing the square
Makovka662 [10]

Answer:

x1 = 6 + 2√6 or x2 = 6 - 2√6

Step-by-step explanation:

x² - 12x + 12 = 0

We need to use formula:

a² - 2ab + b² = (a - b)².

x² - 12x  =  - 12

x² - 2*6x + 6²- 6² = - 12

(x - 6)² - 36 = -12

(x - 6)² = - 12 + 36

(x -6)² = 24

(x - 6) = √24 or (x-6) = -√24

(x - 6) = 2√6 or (x-6) = - 2√6

x = 6 + 2√6 or x = 6 - 2√6

3 0
3 years ago
PLEASE HELP!!! WILL MARK AS BRAINLIEST!!
koban [17]

Answer:

A:60

Step-by-step explanation:

9ftx10ft= 90 ft squared = 1080 inches

1080/36 (6x6=36) inches= 30 white tiles x2 because of the ratio

60 white tiles

8 0
3 years ago
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Hatshy [7]
I can’t even see da the dawn question LOL
4 0
2 years ago
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