Carry out the following operations, and express the answer with the appropriate number of significant figures:
part a: 320.37-(61016.8/3.3)=?
part b: [(290..100x10^3)]x2.8932=?
part c: (0.0040x29000.0)+(2818x15)=?
part d: 868x[1253-(3.87x108)]=?
i calculated all of them and i want you guys to me check it.
pa: -1.6x10^3
pb: 8.364x10^6
pc: 4.2x10^4
pd: 7.24x10^5

she drove 134 miles

step-by-step explanation:

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;