plz answerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
Answers
Answer:
1)24
2)85.8
3)10 babies. Hence, mean is 4 kg.
Step-by-step explanation:
Q1)
Answer-Given for one correct answer =4
So, marks given for 9 correct answers are
=4 X 9 = 36
Marks given for one incorrect answer
=-2
So, marks given for 6=(15-9) incorrect answers
= (-2) X 6 =-12
Therefore, Gurpreet's total score is
= 36 - 12 = 24
Q2)
Answer-Length-25 1/2cm=51/2 cm
Breadth-17 2/5 cm=87/5 cm
Perimeter-2(L+B)
2(51/2 + 87/5)
2(255+174/10)
2(429/10)
85.8
Q3)
Answer-Mean is given by :-
\begin{gathered} \frac{sum \: of \: observations}{total \: number \: of \: observations} \\ \end{gathered}totalnumberofobservationssumofobservations
Here, observations are the weights of 10 new born babies, which are :-
3.4, 3.6, 4.2, 4.5, 3.9, 4.1, 3.8, 4.5, 4.4, 3.6.
Their sum = 40 kg
and total number = 10 babies.
So, mean =
\begin{gathered} \frac{40}{10} \\ = 4\end{gathered}1040=4
Hence, mean is 4 kg.
→ Mean is a measure of central tendency which gives us a rough idea about the range of observations.