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katovenus [111]
3 years ago
7

Are:

Mathematics
1 answer:
eimsori [14]3 years ago
4 0

Step-by-step explanation:

a. The mean can be found using the AVERAGE() function.

x = 272.7

b. The standard deviation can be found with the STDEV() function.

s = 39.9

c. The t-score can be found with the T.INV.2T() function.  The confidence level is 0.04, and the degrees of freedom is 26.

t = 2.162

d. Find the lower and upper ends of the confidence interval.

Lower = 272.7 − 2.162 × 39.9 = 186.5

Upper = 272.7 + 2.162 × 39.9 = 358.9

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Active
Ber [7]

Answer:

The expressions for the payment made to Mary are,

(Monday) 90 = 15m + b

(Tuesday) 62 = 8m + b

where m and b are the fee per student and the base fee, respectively. Solving for m and b, the values are 4 and 30.

The equation that represents Mary's earning is

y = 4x + 30

For 20 students,

y = 4(20) + 30 = 110

For Lisa's earnings,

y = 8x + 15

Substituting 20,

y =8(20) + 15 = 175

Thus, Lisa would earn more than Mary by $65.

(Btw this is not my work, I got it from someone else on brainly and wanted to help lol)

7 0
3 years ago
A fenced in rectangular region with the dimensions 4 yards by 8 yards is suddenly expanded by the same distance in each dimensio
Korolek [52]

Answer:

The distance added to each dimension is 2 yards.

Step-by-step explanation:

The initial dimensions of the rectangular fence is 8 yards by 4 yards.

The initial area of the rectangular fence = area of a rectangle

area of a rectangle = length x width

So that,

The initial area of the fence = 8 x 4

                                              = 32

The initial area of the fence is 32 square yards.

But, with the new dimensions, area = 60 square yards.

(4 + x) x (8 + x) = 60

x^{2} + 12x + 28 = 60

x^{2} + 12x - 32 = 0

(x + 14) = 0 or (x - 2) = 0

x = -14 or x =2

Thus, x = 2

The distance added to each dimension is 2 yards.

4 0
2 years ago
Round 3.6481 to the hundredths place (two decimal places).To the right
bekas [8.4K]
The correct answer would be 3.65.
4 0
3 years ago
How many 9's are in 99
MrRissso [65]

Answer:

11 or 2

Step-by-step explanation:

11: You take 99/9 to see how many times 9 could go into 99, which would be 11.

2: You just look at the number and you see that there are 2 9s in 99.

-I hope this helps!-

-I didn't know which answer you were looking for so I put both!-

-Please mark as brainliest!-

-Good luck!-

4 0
3 years ago
I need help on number 2 through 9
Phantasy [73]
3: terms/ 12, 8r, -3, s, -5, 15t coefficients/ 8r, 1s, 15t
5 0
3 years ago
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