1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Law Incorporation [45]
2 years ago
13

Lexi Moor has one index card for every letter in the alphabet. She mixes the cards up, closes her eyes, and randomly selects one

. What is the probability she will select a letter which is not in her first name?
Mathematics
2 answers:
DaniilM [7]2 years ago
5 0

Answer:

11/13

Step-by-step explanation:

take out 4 letters that it could be which are L E X and I so you have 22 letters left out of 26 so 22/26 = 11/13

Arlecino [84]2 years ago
5 0
11/13 will be the answer if it’s wrong sorry
You might be interested in
Suppose that an airline overbooks seats on their flights. In particular, it sells 300 tickets for a flight when there are only 2
vladimir1956 [14]

Using the <u>normal approximation to the binomial</u>, it is found that there is a 0.994 = 99.4% probability that we will have enough seats for everyone who shows up.

In a normal distribution with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

  • It measures how many standard deviations the measure is from the mean.  
  • After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X.
  • The binomial distribution is the probability of <u>x successes on n trials</u>, with <u>p probability</u> of a success on each trial. It can be approximated to the normal distribution with \mu = np, \sigma = \sqrt{np(1-p)}.

In this problem:

  • 15% do not show up, so 100 - 15 = 85% show up, which means that p = 0.85.
  • 300 tickets are sold, hence n = 300.

The mean and the standard deviation are given by:

\mu = np = 300(0.85) = 255

\sigma = \sqrt{np(1-p)} = \sqrt{300(0.85)(0.15)} = 6.185

The probability that we will have enough seats for everyone who shows up is the probability of at most <u>270 people showing up</u>, which, using continuity correction, is P(X \leq 270 + 0.5) = P(X \leq 270.5), which is the <u>p-value of Z when X = 270.5</u>.

Z = \frac{X - \mu}{\sigma}

Z = \frac{270.5 - 255}{6.185}

Z = 2.51

Z = 2.51 has a p-value of 0.994.

0.994 = 99.4% probability that we will have enough seats for everyone who shows up.

A similar problem is given at brainly.com/question/24261244

8 0
3 years ago
4x^2+32x+8 is a perfect square trinomial true or false
fgiga [73]

Answer:

The trinomial 4x^2+32x+8 is not a perfect square trinomial because the third term is not a square.

Step-by-step explanation:

A trinomial is an expression composed of three terms that are joined together by addition or subtraction.

A perfect square is created when a value is multiplied times itself. Thus, (a + b)(a + b) = a^2 + 2ab + b^2, making the trinomial a² + 2ab + b² a perfect square.

To show that a trinomial is a perfect square you must show that if the first and third terms are squares, figure out what they're squares of. Multiply those things, multiply that product by 2, and then compare your result with the original quadratic's middle term. If you've got a match (ignoring the sign), then you've got a perfect-square trinomial.

The trinomial 4x^2+32x+8 is not a perfect square trinomial because the third term is not a square.

4 0
3 years ago
Evaluate the equation: e - 3.1 = 5
Anastaziya [24]

Answer:

C. e = 8.1

Step-by-step explanation:

e-3.1= 5

e = 5+3.1

e = 8.1

4 0
3 years ago
PLSSS HELP IF YOU TURLY KNOW THISS
ahrayia [7]

Answer:

<em>hope</em><em> this</em><em> answer</em><em> helps</em><em> you</em><em> dear</em><em>!</em>

7 0
2 years ago
Read 2 more answers
Food costs are expected to rise 6% each month for the next year. which series correctly depicts the cost (to the nearest cent) f
maw [93]
Increment = 6% = 0.06
The explicit formula for the series is;
C(n) = C(n-1)(1.06), where n = nth month, C(n-1) = cost during previous month, C(n) = cost in month n

Applying the explicit formula;
Current cost = $150
2nd month cost = 150*1.06 = $159
3rd month cost = 159*1.06 = $168.54

The second option is correct.
3 0
2 years ago
Read 2 more answers
Other questions:
  • Using the interest formula, compute the true annual interest rate. Loan amount = $9,500 Monthly payments = $227.50 Time of loan
    5·2 answers
  • The school owns 2 classroom sets of 30 calculators each, which students are required to have during their mathematics class. The
    15·2 answers
  • Help me with this problem please
    11·1 answer
  • HELP FAST!!!!!!!! The Mogul Runners ski club planned a trip to Park City. Of the total number of club members, 11 signed up to g
    10·1 answer
  • I really need help with this can you please answer the questions and say how you came up with it please I'm begging you
    15·2 answers
  • Calculate the perimeter of the regular hexagon which has 8 sides <br><br> Pls help I’m stuck
    7·1 answer
  • William and amy are stuffing envelopes for a charity. today William stuffed a total of 70 envelopes. this was 10 more than twice
    7·2 answers
  • What is 2,605 rounded to the nearest hundred
    8·1 answer
  • Lance baked a pie. Justin ate of the pie, and Joey ate of the pie. How much of the pie is left?
    8·2 answers
  • How many 5 bills seth has
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!