Question

Self Practice 15A
1. Riya obtained the following scores (out of 100) in a vocabulary test:
80, 85, 90, 71, 60, 100. What is her mean score?​

Answer 1

SOLUTION :

• Formula of calculating Mean :-

$\: \: \bigstar \: \: \: \large{\boxed{ \bold{ \: Mean = \dfrac{Sum \: \: of \: \: the \: \: observation}{No. \: \: of \: \: observation}}}}$

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❒ Given :-

• Scores obtained by Riya in the vocabulary test are : 80, 85, 90, 71, 60, 100

• Sum of the observations = 80 + 85 + 90 + 71 + 60 + 100 = 486

• No. of the observations = 6

❒ To Find :-

• Mean of the scores = ?

❒ Calculation of mean :-

$\sf{\therefore \: \: Required \: \: mean = \dfrac{Sum \: \: of \: \: the \: \: observation}{No. \: \: of \: \: observation}} \\ \\ \sf{ = \frac{486}{6}} \: \: \: \\ \\ \sf{ = 81} \: \: \: \: \: \:$

• Hence, the mean of scores obtainted by Riya is 81.

Answer 2

Answer:

Answer is 81 brilliant mark me brilliant