The marks obtained by 10 students in a class are as follows- What is the probability that the average mark obtained by a student in the class is less than 70 - in decimals array - c - c - Whine Student - English - Hindi - Mathematics - Science lithline 1 - 87 - 78 - 90 - 89 Whline2 - 90 - 68 - 76 - 78 Whline3 - 79 - 68 - 59 - 61 Whline4 - 71 - 67 - 79 - 57 whline5 - 69 - 91 - 86 - 76 Nilhline 6 - 87 - 85 - 67 - 60 Whline7 - 78 - 90 - 89 - 93 Whline8 - 92 - 76 - 88 - 90 Whline 9 - 77 - 81 - 85 - 86 Whline10 - 86 - 75 - 93 - 89 Whlinelendarray-

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Standard VII

Mathematics

Experimental/ Empirical Probability

The marks obt...

Question

The marks obtained by 10 students in a class are as follows. What is the probability that the average mark obtained by a student in the class is less than 70?(in decimals)

$\begin{matrix} S t u d e n t & E n g l i s h & H i n d i & M a t h e m a t i c s & S c i e n c e 1 & 87 & 78 & 90 & 89 2 & 90 & 68 & 76 & 78 3 & 79 & 68 & 59 & 61 4 & 71 & 67 & 79 & 57 5 & 69 & 91 & 86 & 76 6 & 87 & 85 & 67 & 60 7 & 78 & 90 & 89 & 93 8 & 92 & 76 & 88 & 90 9 & 77 & 81 & 85 & 86 10 & 86 & 75 & 93 & 89 \end{matrix}$

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Solution

$\begin{matrix} S t u d e n t & E n g l i s h & H i n d i & M a t h e m a t i c s & S c i e n c e & A v e r a g e 1 & 87 & 78 & 90 & 89 & 86 2 & 90 & 68 & 76 & 78 & 78 3 & 79 & 68 & 59 & 61 & 66.75 4 & 71 & 67 & 79 & 57 & 68.5 5 & 69 & 91 & 86 & 76 & 80.5 6 & 87 & 85 & 67 & 60 & 74.75 7 & 78 & 90 & 89 & 93 & 87.5 8 & 92 & 76 & 88 & 90 & 86.5 9 & 77 & 81 & 85 & 86 & 82.25 10 & 86 & 75 & 93 & 89 & 85.75 \end{matrix}$

The number of students with average marks less than 70 = 2

Total number of students = 10

The probability of a student securing average mark of less than 70
$= \frac{2}{10} = 0.2$

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The marks obtained by 10 students in a class are as follows, what is the probability that the average mark obtained by a student in the class is less than 70?(in decimals)

$\begin{matrix} Student & English & Hindi & Mathematics & Science 1 & 87 & 78 & 90 & 89 2 & 90 & 68 & 76 & 78 3 & 79 & 68 & 59 & 61 4 & 71 & 67 & 79 & 57 5 & 69 & 91 & 86 & 76 6 & 87 & 85 & 67 & 60 7 & 78 & 90 & 89 & 93 8 & 92 & 76 & 88 & 90 9 & 77 & 81 & 85 & 86 10 & 86 & 75 & 93 & 89 \end{matrix}$

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