Answer: y= 45x miles/hour
Step-by-step explanation:
in the attachment
Answer:
a) Sample mean: 48.71
Sample median: 48.3
Sample variance: 5.41
Sample standard deviation: 2.37
Step-by-step explanation:
a) Sample mean:
Sample median: M=48.3
Note: I order the data increasingly and take the value N / 2 = 40. In this way there are 39 values above and 39 values below the median.
Sample variance:
Sample standard deviation
b)
Answer:
20
Step-by-step explanation:
If the three numbers are x, x+1, and x+2, then:
x (x+1) (x+2) = 990
x (x² + 3x + 2) = 990
x³ + 3x² + 2x - 990 = 0
(x - 9) (x² + 12x + 110) = 0
Since x must be a whole number, x = 9. You can also use simple trial and error to find that the three numbers are 9, 10, 11.
The sum is:
9 + 10 + 11 = 20
Answer:
first or last depending how you are rounding the decimal
=> the best fit is the first one
Step-by-step explanation:
y = 2.55x - 2.15 when x = 5 => y = 10.6 approximately 11
y = 3.21x - 1.75 when x = 5 => y = 14.3 cannot equal or approximately 11
y = -2.15x + 2.55 when x = 5 => y = -8.2 cannot equal or approximately 11
y = 1.75x + 3.15 when x = 5 => y = 11.9 approximately 11
