21. The daily income of bank auditors in MSB Commercial Bank is normally distributed with a mean of ₱675 and a standard deviation of ₱45. What is the z value for the income x of a bank auditor who earns ₱700 daily? (Answer must be rounded to the nearest hundredths.) 22. Given: z = 1.75, σ = 15, and μ = 110. Find x rounded to the nearest whole number. 23. Find the area under the standard normal distribution curve to the right of z = 1.15 and to the left of z = –1.85. 24. The average Pag-ibig salary loan for RFS Pharmacy Inc. employees is ₱23,000. If the debt is normally distributed with a standard deviation of ₱2,500, find the probability that an employee owes less than ₱18,500. 25. The time required to install a new jeepney engine is normally distributed random variable with a mean of 6.5 hours and standard deviation of 0.75 hours. What is the probability that the next installation takes over 7.2 hours?
21. The daily income of bank auditors in MSB Commercial Bank is
with a mean of ₱675 and a standard deviation of ₱45. What is the z value for the income
x of a bank auditor who earns ₱700 daily? (Answer must be rounded to the nearest
hundredths.)
22. Given: z = 1.75, σ = 15, and μ = 110. Find x rounded to the nearest whole number.
23. Find the area under the standard normal distribution curve to the right of z = 1.15
and to the left of z = –1.85.
24. The average Pag-ibig salary loan for RFS Pharmacy Inc. employees is ₱23,000. If the
debt is normally distributed with a standard deviation of ₱2,500, find the probability
that an employee owes less than ₱18,500.
25. The time required to install a new jeepney engine is normally distributed random
variable with a mean of 6.5 hours and standard deviation of 0.75 hours. What is the
probability that the next installation takes over 7.2 hours?
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