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To be in the top 10% of the class, a student's score must be higher than 90% of the other scores. Using the standard normal distribution table, we can find that the z-score for the 90th percentile is 1.28. Using the z-score formula, we can find the minimum score needed to be in the top 10% of the class: x = mean + (z-score x standard deviation) = 75 + (1.28 x 10) = 87.8. Therefore, the minimum score needed to be in the top 10% of the class is 87.8.
The conversion of hard water into soft water by boiling or adding calcium hydroxide is called:
Activated charcoal is used to remove colouring matter from pure substances by which of the following process?
Perspiration cools the body because
The orbital velocity of a satellite depends on:
Which of the following is the lightest metal?
Which reaction represents the correct method of extracting iron from its ore in a blast furnace?
Which gas is used to convert vegetable oils into solid fats?
What happens when one s orbital and one p orbital hybridize?
Which type of bond is formed by the sharing of electrons?
Turquoise is an ore/mineral of: