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
natima [27]
3 years ago
13

Twenty students were surveyed to find out how many hours of TV they watch during a school week. The results are shown to the rig

ht. Answer the following questions and round your answers to the nearest half hour. The mean of the data is ____ hours.
Chemistry
2 answers:
natulia [17]3 years ago
8 0

Answer: 4.5

Explanation:

Just did it

alexandr402 [8]3 years ago
3 0

Answer:

5 Hours

Explanation: I just wanted to save your time and i added all the hours up divided by 20 which i got 4.95 then rounded up to 5.

You might be interested in
What substance is added during hydrolysis in order to break down food macromolecules?
TEA [102]
Hey there! :D

Look at the word hydrolysis. Hydro= water Lysis = split. (Root words) 

So, water (in terms of the word) is added to help split and breakdown macromolecules. 

I hope this helps!
~kaikers
3 0
3 years ago
Read 2 more answers
Help me due tomorrow :,)
lesya [120]

#a

  • Zinc displaces copper

It means

  • Zinc is more reactive than copper

#b

  • Zinc+Copper sulphate--> Zinc sulphate+Copper

#c

No reaction because

  • Magnesium is more reactive than zinc

#d

Reaction occurs

  • Iron is more reactive than copper
  • Magnesium is more reactive than iron

Order:-

  • Cu<Fe<Zn<Mg
3 0
3 years ago
Determine the number of charged particles in nucleus of calcium atom then deduce the number of electrons
Dafna1 [17]

Answer:

detail is given below.

Explanation:

The charged particles of nucleus are protons while neutrons are neutral having no charge.

We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus.

Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.

Symbol of proton= P⁺  

Symbol of neutron= n⁰  

The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.

one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.

While the atomic number is 20.

3 0
3 years ago
An oxygen o2 molecule is adsorbed on a patch of surface (see sketch at right). this patch is known to contain 484 adsorption sit
Naily [24]
We have Boltzmann's equation S = k ln W 
Boltzmann's constant k = 1.381 x 10^-23 J/K
 W = Number of absorption sites
 At W = 484, Entropy S1 = 1.381 x 10^-23 ln 484 = 8.537 x 10^-23 J/K
 At W = 729, Entropy S2 = 1.381 x 10^-23 ln 729 = 9.103 x 10^-23 J/K
 Change of Entropy = S2 - S1 = 0.566 x 10^-23 J/K
7 0
3 years ago
Read 2 more answers
Which of the following fibers should not be in this group?
ryzh [129]

Answer:

Nylon

Explanation:

This should not be in this group

4 0
3 years ago
Other questions:
  • What are other ways you can use wind energy to create electricity?
    10·2 answers
  • Which of the following describes a response to external stimuli?
    5·2 answers
  • Which type of bonding is most important in ch3ch2ch2ch2ch2ch3?
    11·1 answer
  • Does mercury have more protons and electrons than tin?
    10·1 answer
  • CH3(CH2)50CH3<br><br> How many atoms
    12·1 answer
  • Provide the mass number of Fe, which has 29 neutrons
    13·1 answer
  • Indicar que elemento es de transición *
    9·1 answer
  • A sample of oxygen gas occupies a volume of 160 liters at 364 K. What will be the volume of the gas when the temperature drops t
    10·1 answer
  • g Alkenes and alkynes are called unsaturated compounds because ________. they have fewer hydrogen atoms attached to the carbon c
    8·1 answer
  • What’s the purpose ?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!