Listed below are speeds (mi/h) measured from southbound traffic on i-280 near cupertino, california (based on data from sigalert). this simple random sample was obtained at 3: 30 pm on a weekday. use the sample data to construct a 95% confidence interval estimate of the population standard deviation. 62 61 61 57 61 54 59 58 59 69 60 67a.) 4.7 mi/h< < 5.6 mi/h
b.) 2.9 mi/h< < 6.9 mi/h
c.) 3.1 mi/h< < 8.5 mi/h
d.) 1.6 mi/h< < 4.9 mi/h
e.) 5.4 mi/h< < 9.2 mi/h

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft