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Multiple choice maths data handling analysis analysis of frequency distributions analysing data collection of data and presentation of data

Which of the following is an example of time series problem?

1. Estimating number of hotel rooms booking in next $6$ months.
2. Estimating the total sales in next $3$ years of an insurance company.
3. Estimating the number of calls for the next one week.

  1. only $1$
  2. only $2$
  3. $1$ and $2$
  4. $1$, $2$ and $3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All three examples involve data points collected over time, which is the definition of a time series problem.

Multiple choice maths data handling analysis analysis of frequency distributions analysing data collection of data and presentation of data

Data can be classified as :

  1. Primary

  2. Secondary

  3. Both

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Data is classified as both primary and the secondary data.


Primary data is the data which is collected for the first time.
Secondary data is the data which are collected by someone else and passed through the statistical process.

Multiple choice maths negative numbers and integers odd and even numbers operations on integers different types of numbers

If the number of consecutive odd integers whose sum can be expressed as $50^2 - 13^2$ is k then k, can be 

  1. 33

  2. 35

  3. 37

  4. 39
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sum of odd $n$ consecutive numbers $n^2$

$\therefore (1+3+5\dots\dots (2n-1))=n^2$
where $n$ represents the number of terms.
$\therefore 50^2=1+3+5\dots 99=50\text{ }terms$
$\therefore 13^2=1+3+5\dots 25=13\text{ }terms$
$\therefore 50^2-13^2$$=(1+3+5\dots 99)-(1+3+5\dots 25)\=(27+29\dots 99)\ =37\text{ }terms.$