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Damm [24]
3 years ago
6

Can someone please help? i’ll make you a brainliest.

Mathematics
1 answer:
Darya [45]3 years ago
4 0

Answer:

b

Step-by-step explanation:

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A multiple-choice standard test contains total of 25 questions, each with four answers. Assume that a student just guesses on ea
weqwewe [10]

Answer:

a)  8*88*10⁻⁶ ( 0.00088 %)

b) 0.2137 (21.37%)

Step-by-step explanation:

if the test contains 25 questions and each questions is independent of the others, then the random variable X= answer "x" questions correctly , has a binomial probability distribution. Then

P(X=x)= n!/((n-x)!*x!)*p^x*(1-p)^(n-x)

where

n= total number of questions= 25

p= probability of getting a question right = 1/4

then

a) P(x=n) = p^n = (1/4)²⁵ = 8*88*10⁻⁶ ( 0.00088 %)

b) P(x<5)= F(5)

where F(x) is the cumulative binomial probability distribution- Then from tables

P(x<5)= F(5)= 0.2137 (21.37%)

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3 years ago
Please look at picture for question
SCORPION-xisa [38]

Answer:

a=0.62

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5 0
2 years ago
Teresa runs each lap in 5 minutes. She will run less than
horrorfan [7]

Answer:

11 laps i think

Step-by-step explanation:

mark brainliest and have a great day!

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What IS the simplified value of the expression below? -2.6 + 5.8
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Solve each proportion t/9=35/6
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The answer to the proportion is t=52.5
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