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True [87]
3 years ago
6

What is the result of converting 81 inches to feet remember there are 12 inches in a foot?

Mathematics
2 answers:
AlekseyPX3 years ago
7 0
81 inches converted to feet is 6.75 feet
krok68 [10]3 years ago
6 0

Answer:

81 inches = 6.75 feet

Step-by-step explanation:

We have to convert 81 inches to feet.

As it is given 12 inches = 1 foot

So to convert 81 inches to foot, we have to divide 81 inches by 12 inches.

81 inches = \frac{81}{12} = 6.75 feet.

Answer would be 81 inches = 6.75 feet

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(CO6) From a random sample of 68 businesses, it is found that the mean time that employees spend on personal issues each week is
satela [25.4K]

Answer:

(1) (4.82, 4.98)

(2) Large sample size

(3) Yes, the temperature is within the confidence interval of (37.40, 37.60)

(4) (15.083, 15.117)

Step-by-step explanation:

Confidence Interval (CI) = mean + or - (t×sd)/√n

(1) mean = 4.9, sd = 0.35, n = 68, degree of freedom = n-1 = 68 - 1 = 67

t-value corresponding to 67 degrees of freedom and 95% confidence level is 1.9958

CI = 4.9 + (1.9958×0.35)/√68 = 4.98

CI = 4.9 - (1.9958×0.35)/√68 = 4.82

CI is (4.82, 4.98)

(2) Error margin = (t-value × standard deviation)/√sample size

From the formula above, error margin varies inversely as the square root of the sample size. Since the relationship between the error margin and sample size is inverse, increase in one (sample size) will conversely lead to a decrease in the other (error margin)

(3) mean = 37.5, sd = 0.6, n= 100, degree of freedom = n-1 = 100-1 = 99

t-value corresponding to 99 degrees of freedom and 90% confidence level is 1.6602

CI = 37.5 + (1.6602×0.6)/√100 = 37.5 + 0.10 = 37.60

CI = 37.5 - (1.6602×0.6)/√100 = 37.5 - 0.10 = 37.40

37.53 is within the confidence interval (37.40, 37.60)

(4) mean = 15.10, sd =0.08, n = 104, degree of freedom = n-1 = 104-1 = 103

t-value corresponding to 103 degrees of freedom and 97% confidence interval is 2.2006

CI = 15.10 + (2.2006×0.08)/√104 = 15.10 + 0.017 = 15.117

CI = 15.10 - (2.2006×0.08)/√104 = 15.10 - 0.017 = 15.083

CI is (15.083, 15.117)

4 0
3 years ago
Write an equation of a line that is parallel to y=-3x+5 that passes through the point (0,-4)
elena55 [62]

Answer:

{ \rm{y =  - 3x + 5}}

Gradient = -3

• Parallel lines have the same gradient, therefore gradient, m is -3

{ \rm{y = mx + c}}

• At point (0, -4)

{ \rm{ - 4 = ( - 3 \times 0) + c}} \\  \\ { \rm{c =  - 4}}

y intercept is -4

{ \boxed{ \boxed{ \mathfrak{answer : }}{ \rm{\:  \: y =  - 3x - 4}}}}

6 0
3 years ago
(HELP WITH THIS )Suppose ages of cars driven by company employees are normally distributed with a mean of 8 years and a
8090 [49]

Answer:

Let say 75% of  cars older than age  = Y  years

than 25 % cars of age less than Y Years

Z score corresponding to 25 %  =  -0.674

Z score = (Value - Mean) /SD

Value = Y

Mean = 8

SD = 3.2

Z score = -0.674

-0.674 = (Y - 8)/3.2

=> Y =5.84 Years

=> Y ≈ 5.9 Years

Approximately 75% of cars driven by company employees are older than  about 5.9 years

Learn More:

Assume that adults have iq scores that are normally distributed with ...

brainly.in/question/11133397

Use technology or the z-distribution table on pages A-1 to A-2 in the ...

4 0
3 years ago
Please complete the system of equations.
likoan [24]

Answer:

Step-by-step explanation:

Eliminate the y terms by adding the equations together:

-10y+9x = -9

10y+5x = -5

——————-

14x = -14

x = -1

y = 0

6 0
3 years ago
7 MORE picture below
Tema [17]

Answer:

thats a acute angle witch is 62

Step-by-step explanation:

8 0
2 years ago
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