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bekas [8.4K]
3 years ago
15

A student takes an 18-question, multiple-choice exam with five choices for each question and guesses on each question. Assume th

e variable is binomial. Part: 0 / 20 of 2 Parts Complete Part 1 of 2 Find the probability of guessing at least 9 out of 18 correctly. Round the answer to at least four decimal places.
Mathematics
1 answer:
Kobotan [32]3 years ago
7 0

Answer:

Probability of getting at least 9 out of 18 correctly is 0.0043

Step-by-step explanation:

We have

n = 18

p = 1/5 for correct answer

q = 4/5 for wrong answer

P( 9 \leq X \leq 18) = 1 - P(0 \leq X\leq 8)

                       = 1 -  0.9957

                         =0.0043

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A toy manufacturer makes a toy truck, a toy car, and a toy boat. The production spreadsheet is:Toy Time to Produce Cost to Produ
alisha [4.7K]
                 time                    profit               number
truck          10 min              1.00dollar         t
car             12min               1.50 dollar        c
boat           8min                 0.60 dollar        b

let the worker produce t trucks, c cars, and b boats.
10t+12c+8b=400
t+1.5c+0.6b is more than or equal to 35
t is more than or equal to 0
c is more than or equal to zero
b is more than or equal to zero

(this question is kinda wierd. i do not know if i am correct, because mine is not exactly a system of inequalities, but if you really need an answer, you can try this one.)


6 0
3 years ago
Helppp and explain thankyouuu
sergij07 [2.7K]

We have that

x - 3y = 12 and -x + y = 4

We add the 2 equations together

x - 3y + (-x + y) = 16

-> -2y = 16

-> y = -8 (1)

We plug y = -8 into -x + y =4

-> -x - 8 = 4

-> -x = 12

-> x = - 12 (2)

From (1) and (2) we could conclude that the answer is B

3 0
3 years ago
25+(-12)+9=<br><br> plz do help as fast as can
Leokris [45]

Answer:

25-12+9=22

Step-by-step explanation:

pls mark as brainliest

8 0
3 years ago
PLZ HELP ASAP
taurus [48]
When a shape's area is 9 times as great, the one dimension difference is √9=3 times as great. Therefore the length of all sides are 3 times of the corresponding sides of the original shape. The shortest side in the original shape is 3, the larger one is 3 times of that, which is 9. General rule, if a similar shape is x times ratio in terms of sides, the area will be x^2 times the original.  <span>Hope it helps.</span>
7 0
3 years ago
Read 2 more answers
Answer in factored form x^2-2x-35
kozerog [31]
What 2 numbers multiply to -35 and add to -2
the bigger factor is negative since they add to a negative number

add factors, bigger one is negative
1-35=-34, nope
5-7=-2, yep

(x+5)(x-7)
6 0
3 years ago
Read 2 more answers
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