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  1. The first 10 natural numbers are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. To calculate the mean, use the formula: Mean = (Sum of all observations) / (Number of observations). Calculate the sum of the first 10 natural numbers. This is an arithmetic progression (AP) with: - First term (a) = 1, - Last term (l)Read more

    The first 10 natural numbers are:
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

    To calculate the mean, use the formula:
    Mean = (Sum of all observations) / (Number of observations).

    Calculate the sum of the first 10 natural numbers.
    This is an arithmetic progression (AP) with:
    – First term (a) = 1,
    – Last term (l) = 10,
    – Number of terms (n) = 10.

    The sum of an AP is given by:
    Sum = n/2 × (a + l).

    Substitute the values:
    Sum = 10/2 × (1 + 10),
    Sum = 5 × 11,
    Sum = 55.

    Calculate the mean.
    Mean = Sum / Number of observations,
    Mean = 55 / 10,
    Mean = 5.5.

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    • 28
  2. To calculate the average of the numbers, use the formula: Average = (Sum of all observations) / (Number of observations). Calculate the sum of the numbers. The numbers are: 10, 8, 9, 7, 8. Sum = 10 + 8 + 9 + 7 + 8 = 42. Count the number of observations. There are 5 numbers in the list. Calculate theRead more

    To calculate the average of the numbers, use the formula:
    Average = (Sum of all observations) / (Number of observations).

    Calculate the sum of the numbers.
    The numbers are: 10, 8, 9, 7, 8.
    Sum = 10 + 8 + 9 + 7 + 8 = 42.

    Count the number of observations.
    There are 5 numbers in the list.

    Calculate the average.
    Average = Sum / Number of observations,
    Average = 42 / 5,
    Average = 8.4.

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    • 22
  3. The first ten multiples of 3 are: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30. To find the median, arrange the numbers in ascending order (already done above). Since there are 10 numbers (an even count), the median is the average of the two middle numbers. The two middle numbers are the 5th and 6th numbersRead more

    The first ten multiples of 3 are:
    3, 6, 9, 12, 15, 18, 21, 24, 27, 30.

    To find the median, arrange the numbers in ascending order (already done above). Since there are 10 numbers (an even count), the median is the average of the two middle numbers. The two middle numbers are the 5th and 6th numbers in the list:
    5th number = 15,
    6th number = 18.

    The median is calculated as:
    Median = (15 + 18) / 2,
    Median = 33 / 2,
    Median = 16.5.

    For more please visit here:
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    • 12
  4. The first ten multiples of 2 are: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20. To calculate the mean, use the formula: Mean = (Sum of all observations) / (Number of observations). Calculate the sum of the first ten multiples of 2. Sum = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20. This is an arithmetic progrRead more

    The first ten multiples of 2 are:
    2, 4, 6, 8, 10, 12, 14, 16, 18, 20.

    To calculate the mean, use the formula:
    Mean = (Sum of all observations) / (Number of observations).

    Calculate the sum of the first ten multiples of 2.
    Sum = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20.

    This is an arithmetic progression (AP) with:
    – First term (a) = 2,
    – Last term (l) = 20,
    – Number of terms (n) = 10.

    The sum of an AP is given by:
    Sum = n/2 × (a + l).

    Substitute the values:
    Sum = 10/2 × (2 + 20),
    Sum = 5 × 22,
    Sum = 110.

    Calculate the mean.
    Mean = Sum / Number of observations,
    Mean = 110 / 10,
    Mean = 11.

    For more please visit here:
    https://www.tiwariacademy.in/ncert-solutions/class-9/maths/

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    • 27
  5. The first ten multiples of 5 are: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50. To calculate the mean, use the formula: Mean = (Sum of all observations) / (Number of observations). Calculate the sum of the first ten multiples of 5. Sum = 5 + 10 + 15 + 20 + 25 + 30 + 35 + 40 + 45 + 50. This is an arithmeticRead more

    The first ten multiples of 5 are:
    5, 10, 15, 20, 25, 30, 35, 40, 45, 50.

    To calculate the mean, use the formula:
    Mean = (Sum of all observations) / (Number of observations).

    Calculate the sum of the first ten multiples of 5.
    Sum = 5 + 10 + 15 + 20 + 25 + 30 + 35 + 40 + 45 + 50.

    This is an arithmetic progression (AP) with:
    – First term (a) = 5,
    – Last term (l) = 50,
    – Number of terms (n) = 10.

    The sum of an AP is given by:
    Sum = n/2 × (a + l).

    Substitute the values:
    Sum = 10/2 × (5 + 50),
    Sum = 5 × 55,
    Sum = 275.

    Calculate the mean.
    Mean = Sum / Number of observations,
    Mean = 275 / 10,
    Mean = 55.

    For more please visit here:
    https://www.tiwariacademy.in/ncert-solutions/class-9/maths/

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