HELP ME I VERY STRESSED(⓿

QUICK! Giving Brainliest to whoever gives the correct answer

romanna [79]

Answer:

taco bell

Step-by-step explanation:

per one taco at taco bell $0.53

per one taco at los comales $0.62

6 0

3 years ago

Suppose you take a 30-question, multiple-choice test, in which each question contains 4 choices: A, B, C, and D. If you randomly

mina [271]

Answer:

(a) The probability you pass the exam is 0.0000501.

(b) The expected number of correct guesses is 7.5.

(c) The standard deviation is 2.372.

Step-by-step explanation:

We are given that you take a 30-question, multiple-choice test, in which each question contains 4 choices: A, B, C, and D. And you randomly guess on all 30 questions.

Since there is an assumption of only 1 correct choice out of 4 which means the above situation can be represented through binomial distribution;

$P(X =x) = \binom{n}{r}\times p^{r}\times (1-p)^{n-r} ; x = 0,1,2,3,......$

where, n = number of trials (samples) taken = 30

r = number of success = at least 60%

p = probbaility of success which in our question is the probability

of a correct answer, i.e; p = $\frac{1}{4}$ = 0.25

Let X = Number of questions that are correct

So, X ~ Binom(n = 30 , p = 0.25)

(a) The probability you pass the exam is given by = P(X $\geq$ 18)

Because 60% of 30 = 18

P(X $\geq$ 18) = P(X = 18) + P(X = 19) +...........+ P(X = 29) + P(X = 30)

= $\binom{30}{18}\times 0.25^{18}\times (1-0.25)^{30-18} + \binom{30}{19}\times 0.25^{19}\times (1-0.25)^{30-19} +.......+ \binom{30}{29}\times 0.25^{29}\times (1-0.25)^{30-29} + \binom{30}{30}\times 0.25^{30}\times (1-0.25)^{30-30}$

= 0.0000501

(b) The expected number of correct guesses is given by;

Mean of the binomial distribution, E(X) = $n \times p$

= $30 \times 0.25$ = 7.5

(c) The standard deviation of the binomial distribution is given by;

S.D.(X) = $\sqrt{n \times p \times (1-p)}$

= $\sqrt{30 \times 0.25 \times (1-0.25)}$

= $\sqrt{5.625}$ = 2.372

8 0

4 years ago

What are all examples of rational numbers?

tresset_1 [31]

Answer:

1/7, 2, 0.62, 40000000002342, 13, 23/478

Step-by-step explanation:

A number is rational if we can write it as a fraction, where both denominator and numerator are integers and denominator is a non-zero number.

6 0

3 years ago

Marcus is observing bacteria multiply.every 15 seconds,there are 10 times more bacteria than before.if there are 10 bacteria now

r-ruslan [8.4K]

No he is wrong there will be 150000000 bacteria on it at 2 minutes

WORK:

2 min=120 sec
120 divided by 15=8
15 times 10 (7 times)
u get 150,000,000

8 0

3 years ago

Which expressions have a value of Negative StartFraction 1 Over 64 EndFraction? Check all that apply.

Fantom [35]

Correct Options are:

Option A: (Negative one-fourth) cubed

Option B: Negative (one-fourth) cubed

Option D: Negative (StartFraction 1 Over 8 EndFraction) squared

Option F: Negative (one-half) Superscript 6

Step-by-step explanation:

We need to check the expressions that have value $-\frac{1}{64}$

Option A: (Negative one-fourth) cubed

$(-\frac{1}{4})^3$

Solving: $(-\frac{1}{4})^3$

We get $-\frac{1}{64}$

So, Option A is correct.

Option B: Negative (one-fourth) cubed

$-(\frac{1}{4})^3$

Solving: $-(\frac{1}{4})^3$

We get $-\frac{1}{64}$

So, Option B is correct

Option C: (Negative StartFraction 1 Over 8 EndFraction cubed

$(-\frac{1}{8})^3$

Solving: $(-\frac{1}{8})^3$

We get $-\frac{1}{512}$

So, Option C is not correct.

Option D: Negative (StartFraction 1 Over 8 EndFraction) squared

$-(\frac{1}{8})^2$

Solving: $-(\frac{1}{8})^2$

We get $-\frac{1}{64}$

So, Option D is correct.

Option E: (Negative one-half) Superscript 6

$(-\frac{1}{2})^6$

Solving: $(-\frac{1}{2})^6$

We get: $\frac{1}{64}$

So, Option E is not correct.

Option F: Negative (one-half) Superscript 6

$-(\frac{1}{2})^6$

Solving: $-(\frac{1}{2})^6$

We get: $-\frac{1}{64}$

So, Option F is correct.

So, correct Options are: Option A, B, D and F

6 0

3 years ago

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