A national standard requires that public bridges over 20 feet in length must be inspected and rated every 2 years. The rating scale ranges from 0 (poorest rating) to 9 (highest rating). A group of engineers used a probabilistic model to forecast the inspection ratings of all major bridges in a city. For the year 2020, the engineers forecast that 9% of all major bridges in that city will have ralings of 4 or below. Complete parts a and b. a. Use the forecast to find the probability that in a random sample of 9 major bridges in the city, at least 3 wil have an inspection rating of 4 or below in 2020. P(x 23) = Round to five decimal places as neaded.)

A: We will see the ans in next step

A: 64y2+7=32

A: Let us consider that                     A=abcdWe have                   (3A)-1=-3-242 ⟹…

A: The product of 4 and n is -48

A: 4y = 12 y = 3

A: This is is simple factorization question  Formula used (a2-b2)=(a+b)(a-b)

A: Given,     -7 = 2r + 1         ⇒  2r = -7 -1         ⇒   2r = -8        ⇒     r =  -82

A:

A:

A: Solve the following

A: solve the given 3n+20=15

A: To simplify any expression involving numbers we need to use the BODMAS rule which specifies the…

A: To determine:

A: Given  -4d=-64

A:

A: Given,   A+12=13     We will solve it for the value of A

A: Given query is to perform indicated mathematics operation.

A: To solve the given equation for 'n'.3n+14=-4

A: Simplify the above expression.

A: We know that,                         ∫1xdx=lnx+ c We need to find  ∫4xdx

A: Given 2+ 36 = 38  Yes the given statement is true .