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It is known that 60% of households in South Africa own at least one dog. What is the mean number of dogs per household in South Africa?
It is known that 60% of households in South Africa own at least one dog. A survey is carried out on 20 households. The probability that 12 households visited have at least one dog is?
The probability that a randomly selected family in South Africa watches Isidingo is 0.53 and the probability that they watch Grey’s Anatomy is 0.87, whereas the probability that they watch both Isidingo and Grey’s Anatomy is 0.46. The probability that a randomly selected family watches neither Isidingo nor Grey’s Anatomy is
The probability that a randomly selected family in South Africa watches Isidingo is 0.53 and the probability that they watch Grey’s Anatomy is 0.87, whereas the probability that they watch both Isidingo and Grey’s Anatomy is 0.46. The probability that a randomly selected family watches neither Isidingo nor Grey’s Anatomy is?
An element with mass 640 grams decays by 7.3% per minute. How much of the element is remaining after 8 minutes, to the nearest 10th of a gram?
a) Create a java project named school
b) Add two classes, namely student and lect
c) In student class, create the following methods:
i. calculate_stud_age – This method should take year of birth of the student as a
parameter and calculate and return the student’s age
ii. calculate_ave_mark – This method should take three marks of the student ,
Math, English and Physics marks as parameters and return the average mark.
d) In the lect class, create the following methods:
i. get_name – This method should take a string (name of the lect) and
an integer (experience of the lect in years). This method should
output the name of the Lect together with his designation
based on the years of experiences determined by the following:
Professor – if experience is >= 20 years
Associate professor – if experience is >=15 years
Senior lecturer – if experience is >= 10 years
Associate lecturer – if experience is >=5 years
Junior lecturer – if experience is <5 years
3. The production function of a firm is described by the following equation 𝑸=𝟏𝟎,𝟎𝟎𝟎𝑳−𝟑𝑳 𝟐 where L stands for the units of labor.
a) Draw a graph for this equation. Use the quantity produced in the y-axis, and the units of labor in the x-axis.
b) What is the maximum production level?
c) How many units of labor are needed at that point?
based on packet switching and routing as well as te other problems of media resistance and interference.discuss the network performance characteristics
b) Find the power delivered to an element at t = 3 ms if the current entering its positive terminal is i = 5cos60πt A and the voltage is
(i) v = 3i
(ii) v = 3di/dt
Answer the following questions.
1. (a) The formula of six compounds are given below.
C3H8, CH3CH2OH, CH3-O-CH2-CH3, HCOOH, CH3COOH
(i) Name the type of intermolecular forces present in the compounds.
(ii) Arrange these compounds in the order of increasing boiling point. explain your answer.
(i) Explain the polarity of the following simple covalent molecules: H2O, CO2, and SO2.
(ii) Which is the most polar molecule amo them? Explain.
To precipitate all the sulfate ions from 22.0 mL of 0.150 molarity aluminum sulfate as barium sulfate, how many mL of 0.250 molarity3. barium nitrate are required? (8 points)
____Ba(NO3)2(aq)+____Al2(SO4)3(aq)→______BaSO4(s)+____Al(NO3)3(aq)
To neutralize 15.8 mL of 0.687 molarity sodium hydroxide, how much 0.376 molarity HCl is needed? (5 points)
____HCl(aq)+____NaOH(aq)→____NaCl(aq)+____H(OH)(l)
Glucose is a natural sugar that occurs in abundance. What is the mass percent of a solution formed from 148 g of glucose and 698 g of water? (5 points)
What is the mass percent sucrose in a solution made by combining 365 g of a 8.90 percent sucrose by mass aqueous solution with 145 g of an 6.80 percent sucrose by mass aqueous solution? (5 points)
When 200 mL of 0.700 molarity silver nitrate is introduced to 150 mL of 0.500 molarity potassium chromate, how many grams of silver chromate will precipitate? (12 points)
____ AgNO3(aq) + ____K2CrO4(aq) → ____Ag2CrO4(s)+ ____KNO3(aq)
#340153 on Dec 2023