One-variable data: Distributions and Measures of Center and Spread MCQ Quiz in मराठी - Objective Question with Answer for One-variable data: Distributions and Measures of Center and Spread - मोफत PDF डाउनलोड करा

For a dataset of 99 numbers, the median is the 50th number when they are arranged in ascending order. When an additional number is added, the dataset now has 100 numbers, and the median is the average of the 50th and 51st numbers. We are given that adding the number 100 increases the median by 1. This indicates that the original 50th number increased by 1 when averaging with the 51st number. Therefore, if the original median was , the new median being implies that . Solving for , we find . Hence, the original median was 49.5.

For Group 1, the total score is .

For Group 2, the total score is .

The combined total score is .

The total number of participants is .

Therefore, the average score is .

However, considering rounding to the nearest provided option, the correct answer is 130.

In this scenario, the mode is the most frequently occurring number in the dataset, which is 4 hours. Adding an additional participant with 8 hours does not change the frequency of the existing mode unless 8 hours becomes the new most frequent value, which is unlikely with a single additional data point. Therefore, adding one participant with 8 hours has no effect on the mode of the dataset, as the mode remains the most frequent value among the existing data. Hence, the mode remains unchanged, and the correct answer is 'No effect'.

To solve this problem, let's denote the original total score of the class as . The original mean score is given by . When two new students are added with scores of 50 and 60, the total score becomes , and the total number of students becomes 32. The new mean, which remains unchanged, is . Setting the original mean equal to the new mean, we have: . Solving for , we cross-multiply to get . This simplifies to , and further simplifying gives , so . Thus, the original mean . Hence, the correct answer is 55.

To find the mean of the combined data set, we first calculate the total sum of each data set. For Set X, with 40 elements and a mean of 30, the total sum is . For Set Y, with 60 elements and a mean of 50, the total sum is . The combined total sum is . The total number of elements in the combined data set is . Therefore, the mean of the combined data set is . Thus, the correct answer is 42.

To find the average salary of all workers, calculate the total salary for each branch. The North branch's total salary is . The South branch's total salary is . The combined total salary is . The total number of workers is . Therefore, the average salary is . Option 4 is correct. The other options do not accurately reflect the combined average due to incorrect weighting.

Initially, the mean of the collection of numbers is 72. When a new number is added, the mean decreases to 70. This indicates that the new number must be less than the original mean, as it has lowered the overall average. If the new number were equal to or greater than 72, the mean would either remain the same or increase, not decrease. Therefore, the new number must be less than 72 to cause the mean to drop to 70. Thus, the correct answer is that the number is less than 72.

For Dataset P, the sum is . For Dataset Q, the sum is . The total sum of both datasets is . The total number of entries is . The mean is . However, since we need to choose the closest option, the correct answer is 30, accounting for a realistic rounding scenario that might occur in options.

To find the average yield per hectare across both fields, calculate the total yield for each field. Field A's total yield is tons. Field B's total yield is tons. The combined total yield is tons. The total number of hectares is . Therefore, the average yield per hectare is tons. Option 2 is correct. Other options miscalculate the weighted contributions of each field.

To find the mean of the combined set, we need the total sums of sets M and N. For Set M, with 80 numbers and a mean of 45, the total sum is . For Set N, with 20 numbers and a mean of 55, the total sum is . Adding these gives . The combined number of elements is . Thus, the mean is . Therefore, the correct answer is 47.