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
Salsk061 [2.6K]
2 years ago
11

I need the answer? To the problem.

Mathematics
2 answers:
Harlamova29_29 [7]2 years ago
7 0
What is your problem that you need help with?
iragen [17]2 years ago
3 0
What is the problem?
You might be interested in
A large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1200 hours and a standar
a_sh-v [17]

Answer:

The bulbs should be replaced each 1060.5 days.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

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

The Z-score 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. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 1200, \sigma = 60

How often should the bulbs be replaced so that no more than 1% burn out between replacement periods?

This is the first percentile, that is, the value of X when Z has a pvalue of 0.01. So X when Z = -2.325.

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

-2.325 = \frac{X - 1200}{60}

X - 1200 = -2.325*60

X = 1060.5

The bulbs should be replaced each 1060.5 days.

4 0
3 years ago
What is 69 x 420 <br> Can you sub to me please?
Alex17521 [72]

Answer:

69x420=28,980

Step-by-step explanation:

i will

6 0
3 years ago
Read 2 more answers
Becky put $100 into in the account to use for school expenses. The account earns 11% interest, compounded annually. How much wil
Mnenie [13.5K]

Answer: $187 will be in the account after 6 years.

Step-by-step explanation:

We would apply the formula for determining compound interest which is expressed as

A = P(1+r/n)^nt

Where

A = total amount in the account at the end of t years

r represents the interest rate.

n represents the periodic interval at which it was compounded.

P represents the principal or initial amount deposited

From the information given,

P = $100

r = 11% = 11/100 = 0.11

n = 1 because it was compounded once in a year.

t = 6 years

Therefore,.

A = 100(1 + 0.11/1)^1 × 6

A = 100(1 + 0.11)^6

A = 100(1.11)^6

A = $187

5 0
3 years ago
Hich points are reflections of each other across the y-axis?
Serhud [2]

Answer:

(- 7, - 3) and (7, - 3)

Step-by-step explanation:

The best way to do this is to sketch the graph...when dealing with reflection in the y axis, the value for y remains the same and the value for x becomes negative if it was positive or becomes positive if it was negative

4 0
3 years ago
Read 2 more answers
Which ordered pair is a solution to the system of equations?
babymother [125]
The answer is (-2, -3) since 2*-2–(+)3= -1 and 2*-2-4*-3= 8.
4 0
3 years ago
Other questions:
  • Simplify the expression.
    9·2 answers
  • Vlad wants to determine the rate at which the price increases as the mass of the watermelons his neighbor sells increases. What
    6·2 answers
  • A coffee machine can be adjusted to deliver any fixed number of ounces of coffee. if the machine has a standard deviation in del
    12·1 answer
  • A package of 8 pens costs $1.09. Milo’s work to find the unit price of the pack is shown below.
    5·2 answers
  • How many integers from 0 through 30, including 0 and 30, must you pick to be sure of getting at least one integer?
    5·1 answer
  • 300 is ten times as much as?
    13·2 answers
  • How much money will you need to invest initially to have $2,500.00 in four years if the money is compounded quarterly at an annu
    6·1 answer
  • HELP ASAP!!!!!!! I NEED THIS SOON!!!
    8·2 answers
  • Let r = 9.4 and L = 18.2. Find surface area of figure
    13·1 answer
  • Using synthetic division, find (2x4 − 3x3 − 20x − 21) ÷ (x − 3).
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!