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
musickatia [10]
4 years ago
7

Someone help me please

Mathematics
1 answer:
aleksklad [387]4 years ago
8 0
68% of the time, values will be within ONE std dev of the mean.
Thus, if the mean is 50 and the std. dev is 5, values will be between 45 and 55.
45 is one std dev below the mean, whereas 55 is one std dev above.

40 and 60 represent 2 std dev below the mean and above the mean, respectively.  95% of the time, values will be within the interval (40,60).

Here we're making use of the so called EMPIRICAL RULE.

99.9% of the time, values will lie within 3 std dev of the mean.  This comes out to (45, 65).  Unsure of how to conclude the 3rd question here.

You might be interested in
Find the equations of the two lines through the point (-5,5) which are at a distance of root 5 from the
alekssr [168]

Answer:

Step-by-step explanation:

hello : here is an solution

4 0
3 years ago
A jewellery shop sells 240 necklaces in a month. 18 of the necklaces were sold via the shop's website, the rest were sold in hig
ICE Princess25 [194]

Answer: 3 : 37

Step-by-step explanation:

The shop sold 240 necklaces in a month.

Out of these, 18 were sold online.

The number that was sold offline was therefore:

= 240 - 18

= 222 shop sales

The ratio of  online sales to shop sales is therefore:

18 : 222

Take it to simplest form by dividing both sides by their highest common factor of 6:

3 : 37

5 0
3 years ago
Y=19x+19b solve for b in the literal equation
Ymorist [56]
Y=19x+19b
To solve for b you first need to subtract 19x from both sides giving you:

y-19x=19b


Then, divide by 19 on both sides to get

(y/19)-x=b

So b=(y/19)-x

Hope this helps!!! Follow me :)
3 0
3 years ago
the units digit of a two digit number is 10. If the digits are reversed, the new number is 9 less than the original number. find
Irina-Kira [14]

Answer: the units digit has to be a 1 digit number not 2

Step-by-step explanation:

4 0
3 years ago
CosA×cos2A+sinA×sin2A=cos (2A-A)​
Aleksandr-060686 [28]

Answer:

csc

A

, as desired!

Step-by-step explanation:

cos

2

A

sin

A

+

sin

2

A

cos

A

,

=

cos

2

A

cos

A

+

sin

2

A

sin

A

sin

A

cos

A

,

=

cos

(

2

A

−

A

)

sin

A

cos

A

,

=

cos

A

sin

A

cos

A

,

=

1

sin

A

,

=

csc

A

, as desired!

7 0
3 years ago
Other questions:
  • A die with 12 sides is rolled. What is the probability of rolling a number less than 11?
    10·1 answer
  • Need help on number 4 and 11 pleaseee!!! I need it as soon as possible
    9·1 answer
  • PLEASE HELP! WILL MARK BRAINLIEST!
    11·1 answer
  • Marie will earn $15 per hour at a new job. During training, she will earn $10 per hour. What percent of Marie's regular rate wil
    12·1 answer
  • Which expression is equivalent to 3(10-4y)
    6·1 answer
  • 44735758 x 46639756-435333 divided by 48883 = what pls help will give brainleist
    14·2 answers
  • Sandra has 28 fish in her water garden. Twenty-two of her fish are
    10·2 answers
  • What number must you add to complete the square?
    15·1 answer
  • Uh hey I need help on this
    15·1 answer
  • 1 - 2^3 - 3^2 1 Please answer correctly. Please
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!