Question

The lengths of a particular animal's pregnancies are approximately normally distributed, with mean μ=262 days and standard deviation σ=16 days.

(a) What proportion of pregnancies lasts more than 282 days?

(b) What proportion of pregnancies lasts between234 and 266 days?

(c) What is the probability that a randomly selected pregnancy lasts no more than 246 days?

(d) A "very preterm" baby is one whose gestation period is less than 238 days. Are very preterm babies unusual?

Answer #1

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean μ=265 days and
standard deviation σ=12 days.
(a) What proportion of pregnancies lasts more than 271
days?
(b) What proportion of pregnancies lasts between 262 and 274
days?
(c) What is the probability that a randomly selected pregnancy
lasts no more than 244 days?
(d) A "very preterm" baby is one whose gestation period is
less than 238 days. Are very preterm babies unusual?

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean μ=261 days and
standard deviation σ=20 days.
(a) What proportion of pregnancies lasts more than 296
days?
(b) What proportion of pregnancies lasts between 256 and 266
days?
(c) What is the probability that a randomly selected
pregnancy lasts no more than 251 days?
(d) A "very preterm" baby is one whose gestation period is
less than 231 days. Are very preterm babies unusual?

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean muequals252 days and
standard deviation sigmaequals20 days. (a) What proportion of
pregnancies lasts more than 282 days? (b) What proportion of
pregnancies lasts between 247 and 262 days? (c) What is the
probability that a randomly selected pregnancy lasts no more than
242 days? (d) A "very preterm" baby is one whose gestation
period is less than 222 days. Are very preterm babies unusual?

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean muequals254 days and
standard deviation sigmaequals8 days. (a) What proportion of
pregnancies lasts more than 268 days? (b) What proportion of
pregnancies lasts between 248 and 256 days? (c) What is the
probability that a randomly selected pregnancy lasts no more than
246 days? (d) A "very preterm" baby is one whose gestation
period is less than 234 days. Are very preterm babies unusual?

The lengths of a particular animal's pregnancies are
approximately normally distributed, with μ=261and standard
deviation= 88.
What proportion of pregnancies lasts between 251 and 267
days?
What is the probability that a randomly selected pregnancy lasts
no more than 245 days?
A "very preterm" baby is one whose gestation period is less
than 243 days. Are very preterm babies unusual?

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean equals 274 days and
standard deviation sigma equals 12 days. (a) What proportion of
pregnancies lasts more than 280 days? (b) What proportion of
pregnancies lasts between 268 and 283 days? (c) What is the
probability that a randomly selected pregnancy lasts no more than
256 days? (d) A "very preterm" baby is one whose gestation
period is less than 247 days. Are very preterm babies unusual?

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean muequals264 days and
standard deviation sigmaequals8 days. (a) What (c) What is the
probability that a randomly selected pregnancy lasts no more than
260 days? (d) A "very preterm" baby is one whose gestation
period is less than 244 days. Are very preterm babies unusual?

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean mu equals 259 days
and standard deviation sigma equals 16 days. (a) What proportion
of pregnancies lasts more than 263 days? (b) What proportion of
pregnancies lasts between 255 and 267 days? (c) What is the
probability that a randomly selected pregnancy lasts no more than
247 days? (d) A "very preterm" baby is one whose gestation
period is less than 235 days. Are very preterm babies...

The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean
muμequals=256256
days and standard deviation
sigmaσequals=1212
days.(a) What proportion of pregnancies lasts more than
259259
days?(b) What proportion of pregnancies lasts between
241241
and
262262
days?(c) What is the probability that a randomly selected
pregnancy lasts no more than
238238
days?(d) A "very preterm" baby is one whose gestation period
is less than
226226
days. Are very preterm babies unusual?
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The lengths of a particular animal's pregnancies are
approximately normally distributed, with mean
muμequals=265265
days and standard deviation
sigmaσequals=1616
days.(a) What proportion of pregnancies lasts more than
285285
days?(b) What proportion of pregnancies lasts between
253253
and
273273
days?(c) What is the probability that a randomly selected
pregnancy lasts no more than
237237
days?(d) A "very preterm" baby is one whose gestation period
is less than
229229
days. Are very preterm babies unusual?
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