On a standardized science test the seniors at Fillmore High School have a mean score of 440 with a standard deviation of 80. What is the probabllity that a random sample of 40 seniors has a mean score of at most 4307 If necessary round your answer to the nearest hundredth. The probability that a random sample of 40 seniors has a mean score of at most 430 is about ___. ​

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

false

step-by-step explanation:

false : it can not go to 9 the highest that part can go is 7

here is your proof