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A health specialist wants to determine the average number of hours a person
exercises in a day during the quarantine period. She found out that the mean number
of hours a person exercises in a day during the quarantine period is 80 minutes. A
random sample of 29 persons were surveyed and found that their mean is 65 minutes
and a standard deviation of 10 minutes. Test the hypothesis at 2% level of significance
and assume that the population is normally distributed.
Baby weights: The weight of male babies less than 2 months old in the United States is normally distributed with mean 11.7 pounds and standard deviation 2.9 pounds.
(a) Find the 81st percentile of the baby weights.
(b) Find the 10th percentile of the baby weights.
(c) Find the third quartile of the baby weights.
Use Excel and round the answers to at least two decimal places.
If 8.28 L of hydrogen gas at SATP is produced, how many moles of aluminium were reacted?
The volume of a sample of a gas is 8.39 L at 33oC. What would be the volume if the temperature is changed to 265 K, while the pressure is constant?
consider a solution which is 0.10M in CH3COOh and 0.20 M in naCXH3COO. Which o the following statement is true
Your barangay initiated t a painting contest about local flowers. All the
paintings will be displayed in the “Arts Gallery”. The winners will receive cash price
to be donated to the unfortunate people outside your barangay. Imagine yourself as
one of the contestants, write three statements on how you can influence other
talented youth to join in the contest.
1.
2.
3.
How much heat energy is required to change the temperature of 56.75 g of
water from 23.0 C to 56.7 C? (specific heat capacity of water is 4.18 kJ/(kg
OC))
A dart hits the circular dartboard shown below at a random point. Find the probability that the dart lands in the shaded square region. The radius of the dartboard is 9
in, and each side of the shaded region is 3in.
Two-tailed test; variance is known, alpha = 0.05 , n = 40
Number of occurrence of a tossing four coins
